src/HOL/Library/Univ_Poly.thy
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(*  Title:       Univ_Poly.thy
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    Author:      Amine Chaieb
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*)
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header {* Univariate Polynomials *}
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theory Univ_Poly
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imports Main
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begin
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text{* Application of polynomial as a function. *}
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primrec (in semiring_0) poly :: "'a list => 'a  => 'a" where
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  poly_Nil:  "poly [] x = 0"
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| poly_Cons: "poly (h#t) x = h + x * poly t x"
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subsection{*Arithmetic Operations on Polynomials*}
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text{*addition*}
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primrec (in semiring_0) padd :: "'a list \<Rightarrow> 'a list \<Rightarrow> 'a list"  (infixl "+++" 65)
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where
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  padd_Nil:  "[] +++ l2 = l2"
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| padd_Cons: "(h#t) +++ l2 = (if l2 = [] then h#t
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                            else (h + hd l2)#(t +++ tl l2))"
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text{*Multiplication by a constant*}
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primrec (in semiring_0) cmult :: "'a \<Rightarrow> 'a list \<Rightarrow> 'a list"  (infixl "%*" 70) where
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   cmult_Nil:  "c %* [] = []"
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|  cmult_Cons: "c %* (h#t) = (c * h)#(c %* t)"
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text{*Multiplication by a polynomial*}
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primrec (in semiring_0) pmult :: "'a list \<Rightarrow> 'a list \<Rightarrow> 'a list"  (infixl "***" 70)
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where
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   pmult_Nil:  "[] *** l2 = []"
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|  pmult_Cons: "(h#t) *** l2 = (if t = [] then h %* l2
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                              else (h %* l2) +++ ((0) # (t *** l2)))"
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text{*Repeated multiplication by a polynomial*}
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primrec (in semiring_0) mulexp :: "nat \<Rightarrow> 'a list \<Rightarrow> 'a  list \<Rightarrow> 'a list" where
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   mulexp_zero:  "mulexp 0 p q = q"
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|  mulexp_Suc:   "mulexp (Suc n) p q = p *** mulexp n p q"
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text{*Exponential*}
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primrec (in semiring_1) pexp :: "'a list \<Rightarrow> nat \<Rightarrow> 'a list"  (infixl "%^" 80) where
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   pexp_0:   "p %^ 0 = [1]"
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|  pexp_Suc: "p %^ (Suc n) = p *** (p %^ n)"
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text{*Quotient related value of dividing a polynomial by x + a*}
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(* Useful for divisor properties in inductive proofs *)
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primrec (in field) "pquot" :: "'a list \<Rightarrow> 'a \<Rightarrow> 'a list" where
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   pquot_Nil:  "pquot [] a= []"
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|  pquot_Cons: "pquot (h#t) a = (if t = [] then [h]
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                   else (inverse(a) * (h - hd( pquot t a)))#(pquot t a))"
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text{*normalization of polynomials (remove extra 0 coeff)*}
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primrec (in semiring_0) pnormalize :: "'a list \<Rightarrow> 'a list" where
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  pnormalize_Nil:  "pnormalize [] = []"
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| pnormalize_Cons: "pnormalize (h#p) = (if ( (pnormalize p) = [])
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                                     then (if (h = 0) then [] else [h])
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                                     else (h#(pnormalize p)))"
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definition (in semiring_0) "pnormal p = ((pnormalize p = p) \<and> p \<noteq> [])"
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definition (in semiring_0) "nonconstant p = (pnormal p \<and> (\<forall>x. p \<noteq> [x]))"
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text{*Other definitions*}
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definition (in ring_1)
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  poly_minus :: "'a list => 'a list" ("-- _" [80] 80) where
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  "-- p = (- 1) %* p"
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definition (in semiring_0)
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  divides :: "'a list \<Rightarrow> 'a list \<Rightarrow> bool"  (infixl "divides" 70) where
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  [code del]: "p1 divides p2 = (\<exists>q. poly p2 = poly(p1 *** q))"
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    --{*order of a polynomial*}
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definition (in ring_1) order :: "'a => 'a list => nat" where
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  "order a p = (SOME n. ([-a, 1] %^ n) divides p &
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                      ~ (([-a, 1] %^ (Suc n)) divides p))"
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     --{*degree of a polynomial*}
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definition (in semiring_0) degree :: "'a list => nat" where
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  "degree p = length (pnormalize p) - 1"
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     --{*squarefree polynomials --- NB with respect to real roots only.*}
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definition (in ring_1)
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  rsquarefree :: "'a list => bool" where
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  "rsquarefree p = (poly p \<noteq> poly [] &
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                     (\<forall>a. (order a p = 0) | (order a p = 1)))"
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context semiring_0
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begin
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lemma padd_Nil2[simp]: "p +++ [] = p"
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by (induct p) auto
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lemma padd_Cons_Cons: "(h1 # p1) +++ (h2 # p2) = (h1 + h2) # (p1 +++ p2)"
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by auto
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lemma pminus_Nil[simp]: "-- [] = []"
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by (simp add: poly_minus_def)
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lemma pmult_singleton: "[h1] *** p1 = h1 %* p1" by simp
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end
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lemma (in semiring_1) poly_ident_mult[simp]: "1 %* t = t" by (induct "t", auto)
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lemma (in semiring_0) poly_simple_add_Cons[simp]: "[a] +++ ((0)#t) = (a#t)"
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by simp
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text{*Handy general properties*}
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lemma (in comm_semiring_0) padd_commut: "b +++ a = a +++ b"
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proof(induct b arbitrary: a)
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  case Nil thus ?case by auto
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next
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  case (Cons b bs a) thus ?case by (cases a, simp_all add: add_commute)
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qed
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lemma (in comm_semiring_0) padd_assoc: "\<forall>b c. (a +++ b) +++ c = a +++ (b +++ c)"
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apply (induct a arbitrary: b c)
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apply (simp, clarify)
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apply (case_tac b, simp_all add: add_ac)
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done
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lemma (in semiring_0) poly_cmult_distr: "a %* ( p +++ q) = (a %* p +++ a %* q)"
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apply (induct p arbitrary: q,simp)
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apply (case_tac q, simp_all add: right_distrib)
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done
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lemma (in ring_1) pmult_by_x[simp]: "[0, 1] *** t = ((0)#t)"
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apply (induct "t", simp)
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apply (auto simp add: mult_zero_left poly_ident_mult padd_commut)
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apply (case_tac t, auto)
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done
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text{*properties of evaluation of polynomials.*}
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2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
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lemma (in semiring_0) poly_add: "poly (p1 +++ p2) x = poly p1 x + poly p2 x"
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proof(induct p1 arbitrary: p2)
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  case Nil thus ?case by simp
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next
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  case (Cons a as p2) thus ?case
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    by (cases p2, simp_all  add: add_ac right_distrib)
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qed
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lemma (in comm_semiring_0) poly_cmult: "poly (c %* p) x = c * poly p x"
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apply (induct "p")
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apply (case_tac [2] "x=zero")
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apply (auto simp add: right_distrib mult_ac)
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done
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lemma (in comm_semiring_0) poly_cmult_map: "poly (map (op * c) p) x = c*poly p x"
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  by (induct p, auto simp add: right_distrib mult_ac)
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lemma (in comm_ring_1) poly_minus: "poly (-- p) x = - (poly p x)"
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apply (simp add: poly_minus_def)
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apply (auto simp add: poly_cmult minus_mult_left[symmetric])
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done
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lemma (in comm_semiring_0) poly_mult: "poly (p1 *** p2) x = poly p1 x * poly p2 x"
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proof(induct p1 arbitrary: p2)
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  case Nil thus ?case by simp
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next
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  case (Cons a as p2)
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  thus ?case by (cases as,
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    simp_all add: poly_cmult poly_add left_distrib right_distrib mult_ac)
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qed
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class idom_char_0 = idom + ring_char_0
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lemma (in comm_ring_1) poly_exp: "poly (p %^ n) x = (poly p x) ^ n"
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apply (induct "n")
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apply (auto simp add: poly_cmult poly_mult power_Suc)
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done
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text{*More Polynomial Evaluation Lemmas*}
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lemma  (in semiring_0) poly_add_rzero[simp]: "poly (a +++ []) x = poly a x"
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by simp
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lemma (in comm_semiring_0) poly_mult_assoc: "poly ((a *** b) *** c) x = poly (a *** (b *** c)) x"
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  by (simp add: poly_mult mult_assoc)
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lemma (in semiring_0) poly_mult_Nil2[simp]: "poly (p *** []) x = 0"
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by (induct "p", auto)
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lemma (in comm_semiring_1) poly_exp_add: "poly (p %^ (n + d)) x = poly( p %^ n *** p %^ d) x"
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apply (induct "n")
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apply (auto simp add: poly_mult mult_assoc)
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done
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subsection{*Key Property: if @{term "f(a) = 0"} then @{term "(x - a)"} divides
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 @{term "p(x)"} *}
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lemma (in comm_ring_1) lemma_poly_linear_rem: "\<forall>h. \<exists>q r. h#t = [r] +++ [-a, 1] *** q"
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proof(induct t)
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  case Nil
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  {fix h have "[h] = [h] +++ [- a, 1] *** []" by simp}
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  thus ?case by blast
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next
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  case (Cons  x xs)
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  {fix h
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    from Cons.hyps[rule_format, of x]
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    obtain q r where qr: "x#xs = [r] +++ [- a, 1] *** q" by blast
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    have "h#x#xs = [a*r + h] +++ [-a, 1] *** (r#q)"
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      using qr by(cases q, simp_all add: algebra_simps diff_def[symmetric]
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	minus_mult_left[symmetric] right_minus)
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    hence "\<exists>q r. h#x#xs = [r] +++ [-a, 1] *** q" by blast}
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  thus ?case by blast
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qed
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2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
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lemma (in comm_ring_1) poly_linear_rem: "\<exists>q r. h#t = [r] +++ [-a, 1] *** q"
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by (cut_tac t = t and a = a in lemma_poly_linear_rem, auto)
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2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
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2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
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lemma (in comm_ring_1) poly_linear_divides: "(poly p a = 0) = ((p = []) | (\<exists>q. p = [-a, 1] *** q))"
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proof-
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  {assume p: "p = []" hence ?thesis by simp}
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  moreover
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  {fix x xs assume p: "p = x#xs"
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    {fix q assume "p = [-a, 1] *** q" hence "poly p a = 0"
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	by (simp add: poly_add poly_cmult minus_mult_left[symmetric])}
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    moreover
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    {assume p0: "poly p a = 0"
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      from poly_linear_rem[of x xs a] obtain q r
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      where qr: "x#xs = [r] +++ [- a, 1] *** q" by blast
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      have "r = 0" using p0 by (simp only: p qr poly_mult poly_add) simp
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      hence "\<exists>q. p = [- a, 1] *** q" using p qr  apply - apply (rule exI[where x=q])apply auto apply (cases q) apply auto done}
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    ultimately have ?thesis using p by blast}
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  ultimately show ?thesis by (cases p, auto)
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qed
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2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
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lemma (in semiring_0) lemma_poly_length_mult[simp]: "\<forall>h k a. length (k %* p +++  (h # (a %* p))) = Suc (length p)"
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by (induct "p", auto)
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2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
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lemma (in semiring_0) lemma_poly_length_mult2[simp]: "\<forall>h k. length (k %* p +++  (h # p)) = Suc (length p)"
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by (induct "p", auto)
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2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
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lemma (in ring_1) poly_length_mult[simp]: "length([-a,1] *** q) = Suc (length q)"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
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by auto
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2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
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subsection{*Polynomial length*}
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2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
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lemma (in semiring_0) poly_cmult_length[simp]: "length (a %* p) = length p"
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by (induct "p", auto)
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2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
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lemma (in semiring_0) poly_add_length: "length (p1 +++ p2) = max (length p1) (length p2)"
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apply (induct p1 arbitrary: p2, simp_all)
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apply arith
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done
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   252
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
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lemma (in semiring_0) poly_root_mult_length[simp]: "length([a,b] *** p) = Suc (length p)"
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by (simp add: poly_add_length)
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lemma (in idom) poly_mult_not_eq_poly_Nil[simp]:
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 "poly (p *** q) x \<noteq> poly [] x \<longleftrightarrow> poly p x \<noteq> poly [] x \<and> poly q x \<noteq> poly [] x"
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by (auto simp add: poly_mult)
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2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
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lemma (in idom) poly_mult_eq_zero_disj: "poly (p *** q) x = 0 \<longleftrightarrow> poly p x = 0 \<or> poly q x = 0"
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by (auto simp add: poly_mult)
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diff changeset
   262
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   263
text{*Normalisation Properties*}
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   264
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   265
lemma (in semiring_0) poly_normalized_nil: "(pnormalize p = []) --> (poly p x = 0)"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   266
by (induct "p", auto)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   267
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   268
text{*A nontrivial polynomial of degree n has no more than n roots*}
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   269
lemma (in idom) poly_roots_index_lemma:
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   270
   assumes p: "poly p x \<noteq> poly [] x" and n: "length p = n"
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   271
  shows "\<exists>i. \<forall>x. poly p x = 0 \<longrightarrow> (\<exists>m\<le>n. x = i m)"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   272
  using p n
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   273
proof(induct n arbitrary: p x)
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   274
  case 0 thus ?case by simp
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   275
next
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   276
  case (Suc n p x)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   277
  {assume C: "\<And>i. \<exists>x. poly p x = 0 \<and> (\<forall>m\<le>Suc n. x \<noteq> i m)"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   278
    from Suc.prems have p0: "poly p x \<noteq> 0" "p\<noteq> []" by auto
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   279
    from p0(1)[unfolded poly_linear_divides[of p x]]
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   280
    have "\<forall>q. p \<noteq> [- x, 1] *** q" by blast
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   281
    from C obtain a where a: "poly p a = 0" by blast
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   282
    from a[unfolded poly_linear_divides[of p a]] p0(2)
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   283
    obtain q where q: "p = [-a, 1] *** q" by blast
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   284
    have lg: "length q = n" using q Suc.prems(2) by simp
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   285
    from q p0 have qx: "poly q x \<noteq> poly [] x"
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   286
      by (auto simp add: poly_mult poly_add poly_cmult)
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   287
    from Suc.hyps[OF qx lg] obtain i where
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   288
      i: "\<forall>x. poly q x = 0 \<longrightarrow> (\<exists>m\<le>n. x = i m)" by blast
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   289
    let ?i = "\<lambda>m. if m = Suc n then a else i m"
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   290
    from C[of ?i] obtain y where y: "poly p y = 0" "\<forall>m\<le> Suc n. y \<noteq> ?i m"
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   291
      by blast
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   292
    from y have "y = a \<or> poly q y = 0"
29667
53103fc8ffa3 Replaced group_ and ring_simps by algebra_simps;
nipkow
parents: 29504
diff changeset
   293
      by (simp only: q poly_mult_eq_zero_disj poly_add) (simp add: algebra_simps)
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   294
    with i[rule_format, of y] y(1) y(2) have False apply auto
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   295
      apply (erule_tac x="m" in allE)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   296
      apply auto
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   297
      done}
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   298
  thus ?case by blast
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   299
qed
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   300
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   301
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   302
lemma (in idom) poly_roots_index_length: "poly p x \<noteq> poly [] x ==>
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   303
      \<exists>i. \<forall>x. (poly p x = 0) --> (\<exists>n. n \<le> length p & x = i n)"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   304
by (blast intro: poly_roots_index_lemma)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   305
26313
8590bf5ef343 avoid rebinding of existing facts;
wenzelm
parents: 26194
diff changeset
   306
lemma (in idom) poly_roots_finite_lemma1: "poly p x \<noteq> poly [] x ==>
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   307
      \<exists>N i. \<forall>x. (poly p x = 0) --> (\<exists>n. (n::nat) < N & x = i n)"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   308
apply (drule poly_roots_index_length, safe)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   309
apply (rule_tac x = "Suc (length p)" in exI)
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   310
apply (rule_tac x = i in exI)
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   311
apply (simp add: less_Suc_eq_le)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   312
done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   313
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   314
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   315
lemma (in idom) idom_finite_lemma:
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   316
  assumes P: "\<forall>x. P x --> (\<exists>n. n < length j & x = j!n)"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   317
  shows "finite {x. P x}"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   318
proof-
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   319
  let ?M = "{x. P x}"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   320
  let ?N = "set j"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   321
  have "?M \<subseteq> ?N" using P by auto
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   322
  thus ?thesis using finite_subset by auto
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   323
qed
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   324
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   325
26313
8590bf5ef343 avoid rebinding of existing facts;
wenzelm
parents: 26194
diff changeset
   326
lemma (in idom) poly_roots_finite_lemma2: "poly p x \<noteq> poly [] x ==>
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   327
      \<exists>i. \<forall>x. (poly p x = 0) --> x \<in> set i"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   328
apply (drule poly_roots_index_length, safe)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   329
apply (rule_tac x="map (\<lambda>n. i n) [0 ..< Suc (length p)]" in exI)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   330
apply (auto simp add: image_iff)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   331
apply (erule_tac x="x" in allE, clarsimp)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   332
by (case_tac "n=length p", auto simp add: order_le_less)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   333
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   334
lemma (in ring_char_0) UNIV_ring_char_0_infinte:
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   335
  "\<not> (finite (UNIV:: 'a set))"
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   336
proof
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   337
  assume F: "finite (UNIV :: 'a set)"
29292
11045b88af1a avoid implicit prems -- tuned proofs;
wenzelm
parents: 28952
diff changeset
   338
  have "finite (UNIV :: nat set)"
11045b88af1a avoid implicit prems -- tuned proofs;
wenzelm
parents: 28952
diff changeset
   339
  proof (rule finite_imageD)
11045b88af1a avoid implicit prems -- tuned proofs;
wenzelm
parents: 28952
diff changeset
   340
    have "of_nat ` UNIV \<subseteq> UNIV" by simp
11045b88af1a avoid implicit prems -- tuned proofs;
wenzelm
parents: 28952
diff changeset
   341
    then show "finite (of_nat ` UNIV :: 'a set)" using F by (rule finite_subset)
11045b88af1a avoid implicit prems -- tuned proofs;
wenzelm
parents: 28952
diff changeset
   342
    show "inj (of_nat :: nat \<Rightarrow> 'a)" by (simp add: inj_on_def)
11045b88af1a avoid implicit prems -- tuned proofs;
wenzelm
parents: 28952
diff changeset
   343
  qed
29879
4425849f5db7 Moved FTA into Lib and cleaned it up a little.
nipkow
parents: 29667
diff changeset
   344
  with infinite_UNIV_nat show False ..
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   345
qed
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   346
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   347
lemma (in idom_char_0) poly_roots_finite: "(poly p \<noteq> poly []) =
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   348
  finite {x. poly p x = 0}"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   349
proof
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   350
  assume H: "poly p \<noteq> poly []"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   351
  show "finite {x. poly p x = (0::'a)}"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   352
    using H
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   353
    apply -
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   354
    apply (erule contrapos_np, rule ext)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   355
    apply (rule ccontr)
26313
8590bf5ef343 avoid rebinding of existing facts;
wenzelm
parents: 26194
diff changeset
   356
    apply (clarify dest!: poly_roots_finite_lemma2)
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   357
    using finite_subset
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   358
  proof-
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   359
    fix x i
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   360
    assume F: "\<not> finite {x. poly p x = (0\<Colon>'a)}"
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   361
      and P: "\<forall>x. poly p x = (0\<Colon>'a) \<longrightarrow> x \<in> set i"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   362
    let ?M= "{x. poly p x = (0\<Colon>'a)}"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   363
    from P have "?M \<subseteq> set i" by auto
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   364
    with finite_subset F show False by auto
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   365
  qed
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   366
next
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   367
  assume F: "finite {x. poly p x = (0\<Colon>'a)}"
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   368
  show "poly p \<noteq> poly []" using F UNIV_ring_char_0_infinte by auto
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   369
qed
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   370
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   371
text{*Entirety and Cancellation for polynomials*}
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   372
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   373
lemma (in idom_char_0) poly_entire_lemma2:
26313
8590bf5ef343 avoid rebinding of existing facts;
wenzelm
parents: 26194
diff changeset
   374
  assumes p0: "poly p \<noteq> poly []" and q0: "poly q \<noteq> poly []"
8590bf5ef343 avoid rebinding of existing facts;
wenzelm
parents: 26194
diff changeset
   375
  shows "poly (p***q) \<noteq> poly []"
8590bf5ef343 avoid rebinding of existing facts;
wenzelm
parents: 26194
diff changeset
   376
proof-
8590bf5ef343 avoid rebinding of existing facts;
wenzelm
parents: 26194
diff changeset
   377
  let ?S = "\<lambda>p. {x. poly p x = 0}"
8590bf5ef343 avoid rebinding of existing facts;
wenzelm
parents: 26194
diff changeset
   378
  have "?S (p *** q) = ?S p \<union> ?S q" by (auto simp add: poly_mult)
8590bf5ef343 avoid rebinding of existing facts;
wenzelm
parents: 26194
diff changeset
   379
  with p0 q0 show ?thesis  unfolding poly_roots_finite by auto
8590bf5ef343 avoid rebinding of existing facts;
wenzelm
parents: 26194
diff changeset
   380
qed
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   381
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   382
lemma (in idom_char_0) poly_entire:
26313
8590bf5ef343 avoid rebinding of existing facts;
wenzelm
parents: 26194
diff changeset
   383
  "poly (p *** q) = poly [] \<longleftrightarrow> poly p = poly [] \<or> poly q = poly []"
29667
53103fc8ffa3 Replaced group_ and ring_simps by algebra_simps;
nipkow
parents: 29504
diff changeset
   384
using poly_entire_lemma2[of p q]
53103fc8ffa3 Replaced group_ and ring_simps by algebra_simps;
nipkow
parents: 29504
diff changeset
   385
by (auto simp add: expand_fun_eq poly_mult)
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   386
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   387
lemma (in idom_char_0) poly_entire_neg: "(poly (p *** q) \<noteq> poly []) = ((poly p \<noteq> poly []) & (poly q \<noteq> poly []))"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   388
by (simp add: poly_entire)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   389
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   390
lemma fun_eq: " (f = g) = (\<forall>x. f x = g x)"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   391
by (auto intro!: ext)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   392
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   393
lemma (in comm_ring_1) poly_add_minus_zero_iff: "(poly (p +++ -- q) = poly []) = (poly p = poly q)"
29667
53103fc8ffa3 Replaced group_ and ring_simps by algebra_simps;
nipkow
parents: 29504
diff changeset
   394
by (auto simp add: algebra_simps poly_add poly_minus_def fun_eq poly_cmult minus_mult_left[symmetric])
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   395
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   396
lemma (in comm_ring_1) poly_add_minus_mult_eq: "poly (p *** q +++ --(p *** r)) = poly (p *** (q +++ -- r))"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   397
by (auto simp add: poly_add poly_minus_def fun_eq poly_mult poly_cmult right_distrib minus_mult_left[symmetric] minus_mult_right[symmetric])
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   398
28823
dcbef866c9e2 tuned unfold_locales invocation
haftmann
parents: 28562
diff changeset
   399
subclass (in idom_char_0) comm_ring_1 ..
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   400
lemma (in idom_char_0) poly_mult_left_cancel: "(poly (p *** q) = poly (p *** r)) = (poly p = poly [] | poly q = poly r)"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   401
proof-
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   402
  have "poly (p *** q) = poly (p *** r) \<longleftrightarrow> poly (p *** q +++ -- (p *** r)) = poly []" by (simp only: poly_add_minus_zero_iff)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   403
  also have "\<dots> \<longleftrightarrow> poly p = poly [] | poly q = poly r"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   404
    by (auto intro: ext simp add: poly_add_minus_mult_eq poly_entire poly_add_minus_zero_iff)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   405
  finally show ?thesis .
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   406
qed
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   407
31021
53642251a04f farewell to class recpower
haftmann
parents: 30738
diff changeset
   408
lemma (in idom) poly_exp_eq_zero[simp]:
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   409
     "(poly (p %^ n) = poly []) = (poly p = poly [] & n \<noteq> 0)"
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   410
apply (simp only: fun_eq add: all_simps [symmetric])
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   411
apply (rule arg_cong [where f = All])
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   412
apply (rule ext)
26194
haftmann
parents: 26124
diff changeset
   413
apply (induct n)
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   414
apply (auto simp add: poly_exp poly_mult)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   415
done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   416
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   417
lemma (in semiring_1) one_neq_zero[simp]: "1 \<noteq> 0" using zero_neq_one by blast
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   418
lemma (in comm_ring_1) poly_prime_eq_zero[simp]: "poly [a,1] \<noteq> poly []"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   419
apply (simp add: fun_eq)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   420
apply (rule_tac x = "minus one a" in exI)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   421
apply (unfold diff_minus)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   422
apply (subst add_commute)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   423
apply (subst add_assoc)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   424
apply simp
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   425
done
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   426
31021
53642251a04f farewell to class recpower
haftmann
parents: 30738
diff changeset
   427
lemma (in idom) poly_exp_prime_eq_zero: "(poly ([a, 1] %^ n) \<noteq> poly [])"
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   428
by auto
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   429
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   430
text{*A more constructive notion of polynomials being trivial*}
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   431
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   432
lemma (in idom_char_0) poly_zero_lemma': "poly (h # t) = poly [] ==> h = 0 & poly t = poly []"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   433
apply(simp add: fun_eq)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   434
apply (case_tac "h = zero")
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   435
apply (drule_tac [2] x = zero in spec, auto)
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   436
apply (cases "poly t = poly []", simp)
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   437
proof-
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   438
  fix x
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   439
  assume H: "\<forall>x. x = (0\<Colon>'a) \<or> poly t x = (0\<Colon>'a)"  and pnz: "poly t \<noteq> poly []"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   440
  let ?S = "{x. poly t x = 0}"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   441
  from H have "\<forall>x. x \<noteq>0 \<longrightarrow> poly t x = 0" by blast
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   442
  hence th: "?S \<supseteq> UNIV - {0}" by auto
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   443
  from poly_roots_finite pnz have th': "finite ?S" by blast
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   444
  from finite_subset[OF th th'] UNIV_ring_char_0_infinte
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   445
  show "poly t x = (0\<Colon>'a)" by simp
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   446
  qed
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   447
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   448
lemma (in idom_char_0) poly_zero: "(poly p = poly []) = list_all (%c. c = 0) p"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   449
apply (induct "p", simp)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   450
apply (rule iffI)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   451
apply (drule poly_zero_lemma', auto)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   452
done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   453
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   454
lemma (in idom_char_0) poly_0: "list_all (\<lambda>c. c = 0) p \<Longrightarrow> poly p x = 0"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   455
  unfolding poly_zero[symmetric] by simp
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   456
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   457
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   458
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   459
text{*Basics of divisibility.*}
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   460
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   461
lemma (in idom) poly_primes: "([a, 1] divides (p *** q)) = ([a, 1] divides p | [a, 1] divides q)"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   462
apply (auto simp add: divides_def fun_eq poly_mult poly_add poly_cmult left_distrib [symmetric])
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   463
apply (drule_tac x = "uminus a" in spec)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   464
apply (simp add: poly_linear_divides poly_add poly_cmult left_distrib [symmetric])
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   465
apply (cases "p = []")
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   466
apply (rule exI[where x="[]"])
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   467
apply simp
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   468
apply (cases "q = []")
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   469
apply (erule allE[where x="[]"], simp)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   470
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   471
apply clarsimp
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   472
apply (cases "\<exists>q\<Colon>'a list. p = a %* q +++ ((0\<Colon>'a) # q)")
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   473
apply (clarsimp simp add: poly_add poly_cmult)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   474
apply (rule_tac x="qa" in exI)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   475
apply (simp add: left_distrib [symmetric])
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   476
apply clarsimp
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   477
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   478
apply (auto simp add: right_minus poly_linear_divides poly_add poly_cmult left_distrib [symmetric])
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   479
apply (rule_tac x = "pmult qa q" in exI)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   480
apply (rule_tac [2] x = "pmult p qa" in exI)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   481
apply (auto simp add: poly_add poly_mult poly_cmult mult_ac)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   482
done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   483
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   484
lemma (in comm_semiring_1) poly_divides_refl[simp]: "p divides p"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   485
apply (simp add: divides_def)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   486
apply (rule_tac x = "[one]" in exI)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   487
apply (auto simp add: poly_mult fun_eq)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   488
done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   489
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   490
lemma (in comm_semiring_1) poly_divides_trans: "[| p divides q; q divides r |] ==> p divides r"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   491
apply (simp add: divides_def, safe)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   492
apply (rule_tac x = "pmult qa qaa" in exI)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   493
apply (auto simp add: poly_mult fun_eq mult_assoc)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   494
done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   495
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   496
31021
53642251a04f farewell to class recpower
haftmann
parents: 30738
diff changeset
   497
lemma (in comm_semiring_1) poly_divides_exp: "m \<le> n ==> (p %^ m) divides (p %^ n)"
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   498
apply (auto simp add: le_iff_add)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   499
apply (induct_tac k)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   500
apply (rule_tac [2] poly_divides_trans)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   501
apply (auto simp add: divides_def)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   502
apply (rule_tac x = p in exI)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   503
apply (auto simp add: poly_mult fun_eq mult_ac)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   504
done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   505
31021
53642251a04f farewell to class recpower
haftmann
parents: 30738
diff changeset
   506
lemma (in comm_semiring_1) poly_exp_divides: "[| (p %^ n) divides q;  m\<le>n |] ==> (p %^ m) divides q"
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   507
by (blast intro: poly_divides_exp poly_divides_trans)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   508
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   509
lemma (in comm_semiring_0) poly_divides_add:
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   510
   "[| p divides q; p divides r |] ==> p divides (q +++ r)"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   511
apply (simp add: divides_def, auto)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   512
apply (rule_tac x = "padd qa qaa" in exI)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   513
apply (auto simp add: poly_add fun_eq poly_mult right_distrib)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   514
done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   515
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   516
lemma (in comm_ring_1) poly_divides_diff:
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   517
   "[| p divides q; p divides (q +++ r) |] ==> p divides r"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   518
apply (simp add: divides_def, auto)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   519
apply (rule_tac x = "padd qaa (poly_minus qa)" in exI)
29667
53103fc8ffa3 Replaced group_ and ring_simps by algebra_simps;
nipkow
parents: 29504
diff changeset
   520
apply (auto simp add: poly_add fun_eq poly_mult poly_minus algebra_simps)
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   521
done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   522
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   523
lemma (in comm_ring_1) poly_divides_diff2: "[| p divides r; p divides (q +++ r) |] ==> p divides q"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   524
apply (erule poly_divides_diff)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   525
apply (auto simp add: poly_add fun_eq poly_mult divides_def add_ac)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   526
done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   527
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   528
lemma (in semiring_0) poly_divides_zero: "poly p = poly [] ==> q divides p"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   529
apply (simp add: divides_def)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   530
apply (rule exI[where x="[]"])
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   531
apply (auto simp add: fun_eq poly_mult)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   532
done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   533
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   534
lemma (in semiring_0) poly_divides_zero2[simp]: "q divides []"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   535
apply (simp add: divides_def)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   536
apply (rule_tac x = "[]" in exI)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   537
apply (auto simp add: fun_eq)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   538
done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   539
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   540
text{*At last, we can consider the order of a root.*}
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   541
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   542
lemma (in idom_char_0)  poly_order_exists_lemma:
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   543
  assumes lp: "length p = d" and p: "poly p \<noteq> poly []"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   544
  shows "\<exists>n q. p = mulexp n [-a, 1] q \<and> poly q a \<noteq> 0"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   545
using lp p
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   546
proof(induct d arbitrary: p)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   547
  case 0 thus ?case by simp
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   548
next
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   549
  case (Suc n p)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   550
  {assume p0: "poly p a = 0"
29292
11045b88af1a avoid implicit prems -- tuned proofs;
wenzelm
parents: 28952
diff changeset
   551
    from Suc.prems have h: "length p = Suc n" "poly p \<noteq> poly []" by auto
11045b88af1a avoid implicit prems -- tuned proofs;
wenzelm
parents: 28952
diff changeset
   552
    hence pN: "p \<noteq> []" by auto
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   553
    from p0[unfolded poly_linear_divides] pN  obtain q where
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   554
      q: "p = [-a, 1] *** q" by blast
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   555
    from q h p0 have qh: "length q = n" "poly q \<noteq> poly []"
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   556
      apply -
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   557
      apply simp
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   558
      apply (simp only: fun_eq)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   559
      apply (rule ccontr)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   560
      apply (simp add: fun_eq poly_add poly_cmult minus_mult_left[symmetric])
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   561
      done
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   562
    from Suc.hyps[OF qh] obtain m r where
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   563
      mr: "q = mulexp m [-a,1] r" "poly r a \<noteq> 0" by blast
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   564
    from mr q have "p = mulexp (Suc m) [-a,1] r \<and> poly r a \<noteq> 0" by simp
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   565
    hence ?case by blast}
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   566
  moreover
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   567
  {assume p0: "poly p a \<noteq> 0"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   568
    hence ?case using Suc.prems apply simp by (rule exI[where x="0::nat"], simp)}
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   569
  ultimately show ?case by blast
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   570
qed
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   571
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   572
31021
53642251a04f farewell to class recpower
haftmann
parents: 30738
diff changeset
   573
lemma (in comm_semiring_1) poly_mulexp: "poly (mulexp n p q) x = (poly p x) ^ n * poly q x"
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   574
by(induct n, auto simp add: poly_mult power_Suc mult_ac)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   575
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   576
lemma (in comm_semiring_1) divides_left_mult:
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   577
  assumes d:"(p***q) divides r" shows "p divides r \<and> q divides r"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   578
proof-
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   579
  from d obtain t where r:"poly r = poly (p***q *** t)"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   580
    unfolding divides_def by blast
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   581
  hence "poly r = poly (p *** (q *** t))"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   582
    "poly r = poly (q *** (p***t))" by(auto simp add: fun_eq poly_mult mult_ac)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   583
  thus ?thesis unfolding divides_def by blast
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   584
qed
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   585
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   586
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   587
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   588
(* FIXME: Tidy up *)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   589
31021
53642251a04f farewell to class recpower
haftmann
parents: 30738
diff changeset
   590
lemma (in semiring_1)
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   591
  zero_power_iff: "0 ^ n = (if n = 0 then 1 else 0)"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   592
  by (induct n, simp_all add: power_Suc)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   593
31021
53642251a04f farewell to class recpower
haftmann
parents: 30738
diff changeset
   594
lemma (in idom_char_0) poly_order_exists:
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   595
  assumes lp: "length p = d" and p0: "poly p \<noteq> poly []"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   596
  shows "\<exists>n. ([-a, 1] %^ n) divides p & ~(([-a, 1] %^ (Suc n)) divides p)"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   597
proof-
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   598
let ?poly = poly
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   599
let ?mulexp = mulexp
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   600
let ?pexp = pexp
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   601
from lp p0
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   602
show ?thesis
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   603
apply -
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   604
apply (drule poly_order_exists_lemma [where a=a], assumption, clarify)
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   605
apply (rule_tac x = n in exI, safe)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   606
apply (unfold divides_def)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   607
apply (rule_tac x = q in exI)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   608
apply (induct_tac "n", simp)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   609
apply (simp (no_asm_simp) add: poly_add poly_cmult poly_mult right_distrib mult_ac)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   610
apply safe
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   611
apply (subgoal_tac "?poly (?mulexp n [uminus a, one] q) \<noteq> ?poly (pmult (?pexp [uminus a, one] (Suc n)) qa)")
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   612
apply simp
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   613
apply (induct_tac "n")
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   614
apply (simp del: pmult_Cons pexp_Suc)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   615
apply (erule_tac Q = "?poly q a = zero" in contrapos_np)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   616
apply (simp add: poly_add poly_cmult minus_mult_left[symmetric])
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   617
apply (rule pexp_Suc [THEN ssubst])
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   618
apply (rule ccontr)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   619
apply (simp add: poly_mult_left_cancel poly_mult_assoc del: pmult_Cons pexp_Suc)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   620
done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   621
qed
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   622
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   623
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   624
lemma (in semiring_1) poly_one_divides[simp]: "[1] divides p"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   625
by (simp add: divides_def, auto)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   626
31021
53642251a04f farewell to class recpower
haftmann
parents: 30738
diff changeset
   627
lemma (in idom_char_0) poly_order: "poly p \<noteq> poly []
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   628
      ==> EX! n. ([-a, 1] %^ n) divides p &
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   629
                 ~(([-a, 1] %^ (Suc n)) divides p)"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   630
apply (auto intro: poly_order_exists simp add: less_linear simp del: pmult_Cons pexp_Suc)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   631
apply (cut_tac x = y and y = n in less_linear)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   632
apply (drule_tac m = n in poly_exp_divides)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   633
apply (auto dest: Suc_le_eq [THEN iffD2, THEN [2] poly_exp_divides]
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   634
            simp del: pmult_Cons pexp_Suc)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   635
done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   636
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   637
text{*Order*}
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   638
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   639
lemma some1_equalityD: "[| n = (@n. P n); EX! n. P n |] ==> P n"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   640
by (blast intro: someI2)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   641
31021
53642251a04f farewell to class recpower
haftmann
parents: 30738
diff changeset
   642
lemma (in idom_char_0) order:
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   643
      "(([-a, 1] %^ n) divides p &
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   644
        ~(([-a, 1] %^ (Suc n)) divides p)) =
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   645
        ((n = order a p) & ~(poly p = poly []))"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   646
apply (unfold order_def)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   647
apply (rule iffI)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   648
apply (blast dest: poly_divides_zero intro!: some1_equality [symmetric] poly_order)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   649
apply (blast intro!: poly_order [THEN [2] some1_equalityD])
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   650
done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   651
31021
53642251a04f farewell to class recpower
haftmann
parents: 30738
diff changeset
   652
lemma (in idom_char_0) order2: "[| poly p \<noteq> poly [] |]
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   653
      ==> ([-a, 1] %^ (order a p)) divides p &
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   654
              ~(([-a, 1] %^ (Suc(order a p))) divides p)"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   655
by (simp add: order del: pexp_Suc)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   656
31021
53642251a04f farewell to class recpower
haftmann
parents: 30738
diff changeset
   657
lemma (in idom_char_0) order_unique: "[| poly p \<noteq> poly []; ([-a, 1] %^ n) divides p;
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   658
         ~(([-a, 1] %^ (Suc n)) divides p)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   659
      |] ==> (n = order a p)"
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   660
by (insert order [of a n p], auto)
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   661
31021
53642251a04f farewell to class recpower
haftmann
parents: 30738
diff changeset
   662
lemma (in idom_char_0) order_unique_lemma: "(poly p \<noteq> poly [] & ([-a, 1] %^ n) divides p &
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   663
         ~(([-a, 1] %^ (Suc n)) divides p))
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   664
      ==> (n = order a p)"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   665
by (blast intro: order_unique)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   666
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   667
lemma (in ring_1) order_poly: "poly p = poly q ==> order a p = order a q"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   668
by (auto simp add: fun_eq divides_def poly_mult order_def)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   669
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   670
lemma (in semiring_1) pexp_one[simp]: "p %^ (Suc 0) = p"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   671
apply (induct "p")
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   672
apply (auto simp add: numeral_1_eq_1)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   673
done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   674
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   675
lemma (in comm_ring_1) lemma_order_root:
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   676
     " 0 < n & [- a, 1] %^ n divides p & ~ [- a, 1] %^ (Suc n) divides p
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   677
             \<Longrightarrow> poly p a = 0"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   678
apply (induct n arbitrary: a p, blast)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   679
apply (auto simp add: divides_def poly_mult simp del: pmult_Cons)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   680
done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   681
31021
53642251a04f farewell to class recpower
haftmann
parents: 30738
diff changeset
   682
lemma (in idom_char_0) order_root: "(poly p a = 0) = ((poly p = poly []) | order a p \<noteq> 0)"
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   683
proof-
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   684
  let ?poly = poly
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   685
  show ?thesis
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   686
apply (case_tac "?poly p = ?poly []", auto)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   687
apply (simp add: poly_linear_divides del: pmult_Cons, safe)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   688
apply (drule_tac [!] a = a in order2)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   689
apply (rule ccontr)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   690
apply (simp add: divides_def poly_mult fun_eq del: pmult_Cons, blast)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   691
using neq0_conv
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   692
apply (blast intro: lemma_order_root)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   693
done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   694
qed
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   695
31021
53642251a04f farewell to class recpower
haftmann
parents: 30738
diff changeset
   696
lemma (in idom_char_0) order_divides: "(([-a, 1] %^ n) divides p) = ((poly p = poly []) | n \<le> order a p)"
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   697
proof-
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   698
  let ?poly = poly
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   699
  show ?thesis
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   700
apply (case_tac "?poly p = ?poly []", auto)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   701
apply (simp add: divides_def fun_eq poly_mult)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   702
apply (rule_tac x = "[]" in exI)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   703
apply (auto dest!: order2 [where a=a]
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   704
	    intro: poly_exp_divides simp del: pexp_Suc)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   705
done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   706
qed
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   707
31021
53642251a04f farewell to class recpower
haftmann
parents: 30738
diff changeset
   708
lemma (in idom_char_0) order_decomp:
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   709
     "poly p \<noteq> poly []
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   710
      ==> \<exists>q. (poly p = poly (([-a, 1] %^ (order a p)) *** q)) &
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   711
                ~([-a, 1] divides q)"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   712
apply (unfold divides_def)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   713
apply (drule order2 [where a = a])
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   714
apply (simp add: divides_def del: pexp_Suc pmult_Cons, safe)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   715
apply (rule_tac x = q in exI, safe)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   716
apply (drule_tac x = qa in spec)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   717
apply (auto simp add: poly_mult fun_eq poly_exp mult_ac simp del: pmult_Cons)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   718
done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   719
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   720
text{*Important composition properties of orders.*}
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   721
lemma order_mult: "poly (p *** q) \<noteq> poly []
31021
53642251a04f farewell to class recpower
haftmann
parents: 30738
diff changeset
   722
      ==> order a (p *** q) = order a p + order (a::'a::{idom_char_0}) q"
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   723
apply (cut_tac a = a and p = "p *** q" and n = "order a p + order a q" in order)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   724
apply (auto simp add: poly_entire simp del: pmult_Cons)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   725
apply (drule_tac a = a in order2)+
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   726
apply safe
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   727
apply (simp add: divides_def fun_eq poly_exp_add poly_mult del: pmult_Cons, safe)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   728
apply (rule_tac x = "qa *** qaa" in exI)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   729
apply (simp add: poly_mult mult_ac del: pmult_Cons)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   730
apply (drule_tac a = a in order_decomp)+
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   731
apply safe
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   732
apply (subgoal_tac "[-a,1] divides (qa *** qaa) ")
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   733
apply (simp add: poly_primes del: pmult_Cons)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   734
apply (auto simp add: divides_def simp del: pmult_Cons)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   735
apply (rule_tac x = qb in exI)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   736
apply (subgoal_tac "poly ([-a, 1] %^ (order a p) *** (qa *** qaa)) = poly ([-a, 1] %^ (order a p) *** ([-a, 1] *** qb))")
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   737
apply (drule poly_mult_left_cancel [THEN iffD1], force)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   738
apply (subgoal_tac "poly ([-a, 1] %^ (order a q) *** ([-a, 1] %^ (order a p) *** (qa *** qaa))) = poly ([-a, 1] %^ (order a q) *** ([-a, 1] %^ (order a p) *** ([-a, 1] *** qb))) ")
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   739
apply (drule poly_mult_left_cancel [THEN iffD1], force)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   740
apply (simp add: fun_eq poly_exp_add poly_mult mult_ac del: pmult_Cons)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   741
done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   742
31021
53642251a04f farewell to class recpower
haftmann
parents: 30738
diff changeset
   743
lemma (in idom_char_0) order_mult:
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   744
  assumes pq0: "poly (p *** q) \<noteq> poly []"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   745
  shows "order a (p *** q) = order a p + order a q"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   746
proof-
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   747
  let ?order = order
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   748
  let ?divides = "op divides"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   749
  let ?poly = poly
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   750
from pq0
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   751
show ?thesis
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   752
apply (cut_tac a = a and p = "pmult p q" and n = "?order a p + ?order a q" in order)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   753
apply (auto simp add: poly_entire simp del: pmult_Cons)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   754
apply (drule_tac a = a in order2)+
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   755
apply safe
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   756
apply (simp add: divides_def fun_eq poly_exp_add poly_mult del: pmult_Cons, safe)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   757
apply (rule_tac x = "pmult qa qaa" in exI)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   758
apply (simp add: poly_mult mult_ac del: pmult_Cons)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   759
apply (drule_tac a = a in order_decomp)+
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   760
apply safe
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   761
apply (subgoal_tac "?divides [uminus a,one ] (pmult qa qaa) ")
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   762
apply (simp add: poly_primes del: pmult_Cons)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   763
apply (auto simp add: divides_def simp del: pmult_Cons)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   764
apply (rule_tac x = qb in exI)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   765
apply (subgoal_tac "?poly (pmult (pexp [uminus a, one] (?order a p)) (pmult qa qaa)) = ?poly (pmult (pexp [uminus a, one] (?order a p)) (pmult [uminus a, one] qb))")
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   766
apply (drule poly_mult_left_cancel [THEN iffD1], force)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   767
apply (subgoal_tac "?poly (pmult (pexp [uminus a, one ] (order a q)) (pmult (pexp [uminus a, one] (order a p)) (pmult qa qaa))) = ?poly (pmult (pexp [uminus a, one] (order a q)) (pmult (pexp [uminus a, one] (order a p)) (pmult [uminus a, one] qb))) ")
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   768
apply (drule poly_mult_left_cancel [THEN iffD1], force)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   769
apply (simp add: fun_eq poly_exp_add poly_mult mult_ac del: pmult_Cons)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   770
done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   771
qed
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   772
31021
53642251a04f farewell to class recpower
haftmann
parents: 30738
diff changeset
   773
lemma (in idom_char_0) order_root2: "poly p \<noteq> poly [] ==> (poly p a = 0) = (order a p \<noteq> 0)"
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   774
by (rule order_root [THEN ssubst], auto)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   775
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   776
lemma (in semiring_1) pmult_one[simp]: "[1] *** p = p" by auto
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   777
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   778
lemma (in semiring_0) poly_Nil_zero: "poly [] = poly [0]"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   779
by (simp add: fun_eq)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   780
31021
53642251a04f farewell to class recpower
haftmann
parents: 30738
diff changeset
   781
lemma (in idom_char_0) rsquarefree_decomp:
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   782
     "[| rsquarefree p; poly p a = 0 |]
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   783
      ==> \<exists>q. (poly p = poly ([-a, 1] *** q)) & poly q a \<noteq> 0"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   784
apply (simp add: rsquarefree_def, safe)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   785
apply (frule_tac a = a in order_decomp)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   786
apply (drule_tac x = a in spec)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   787
apply (drule_tac a = a in order_root2 [symmetric])
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   788
apply (auto simp del: pmult_Cons)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   789
apply (rule_tac x = q in exI, safe)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   790
apply (simp add: poly_mult fun_eq)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   791
apply (drule_tac p1 = q in poly_linear_divides [THEN iffD1])
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   792
apply (simp add: divides_def del: pmult_Cons, safe)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   793
apply (drule_tac x = "[]" in spec)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   794
apply (auto simp add: fun_eq)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   795
done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   796
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   797
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   798
text{*Normalization of a polynomial.*}
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   799
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   800
lemma (in semiring_0) poly_normalize[simp]: "poly (pnormalize p) = poly p"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   801
apply (induct "p")
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   802
apply (auto simp add: fun_eq)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   803
done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   804
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   805
text{*The degree of a polynomial.*}
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   806
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   807
lemma (in semiring_0) lemma_degree_zero:
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   808
     "list_all (%c. c = 0) p \<longleftrightarrow>  pnormalize p = []"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   809
by (induct "p", auto)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   810
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   811
lemma (in idom_char_0) degree_zero:
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   812
  assumes pN: "poly p = poly []" shows"degree p = 0"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   813
proof-
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   814
  let ?pn = pnormalize
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   815
  from pN
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   816
  show ?thesis
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   817
    apply (simp add: degree_def)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   818
    apply (case_tac "?pn p = []")
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   819
    apply (auto simp add: poly_zero lemma_degree_zero )
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   820
    done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   821
qed
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   822
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   823
lemma (in semiring_0) pnormalize_sing: "(pnormalize [x] = [x]) \<longleftrightarrow> x \<noteq> 0" by simp
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   824
lemma (in semiring_0) pnormalize_pair: "y \<noteq> 0 \<longleftrightarrow> (pnormalize [x, y] = [x, y])" by simp
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   825
lemma (in semiring_0) pnormal_cons: "pnormal p \<Longrightarrow> pnormal (c#p)"
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   826
  unfolding pnormal_def by simp
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   827
lemma (in semiring_0) pnormal_tail: "p\<noteq>[] \<Longrightarrow> pnormal (c#p) \<Longrightarrow> pnormal p"
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   828
  unfolding pnormal_def
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   829
  apply (cases "pnormalize p = []", auto)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   830
  by (cases "c = 0", auto)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   831
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   832
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   833
lemma (in semiring_0) pnormal_last_nonzero: "pnormal p ==> last p \<noteq> 0"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   834
proof(induct p)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   835
  case Nil thus ?case by (simp add: pnormal_def)
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   836
next
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   837
  case (Cons a as) thus ?case
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   838
    apply (simp add: pnormal_def)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   839
    apply (cases "pnormalize as = []", simp_all)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   840
    apply (cases "as = []", simp_all)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   841
    apply (cases "a=0", simp_all)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   842
    apply (cases "a=0", simp_all)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   843
    done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   844
qed
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   845
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   846
lemma (in semiring_0) pnormal_length: "pnormal p \<Longrightarrow> 0 < length p"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   847
  unfolding pnormal_def length_greater_0_conv by blast
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   848
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   849
lemma (in semiring_0) pnormal_last_length: "\<lbrakk>0 < length p ; last p \<noteq> 0\<rbrakk> \<Longrightarrow> pnormal p"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   850
  apply (induct p, auto)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   851
  apply (case_tac "p = []", auto)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   852
  apply (simp add: pnormal_def)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   853
  by (rule pnormal_cons, auto)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   854
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   855
lemma (in semiring_0) pnormal_id: "pnormal p \<longleftrightarrow> (0 < length p \<and> last p \<noteq> 0)"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   856
  using pnormal_last_length pnormal_length pnormal_last_nonzero by blast
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   857
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   858
lemma (in idom_char_0) poly_Cons_eq: "poly (c#cs) = poly (d#ds) \<longleftrightarrow> c=d \<and> poly cs = poly ds" (is "?lhs \<longleftrightarrow> ?rhs")
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   859
proof
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   860
  assume eq: ?lhs
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   861
  hence "\<And>x. poly ((c#cs) +++ -- (d#ds)) x = 0"
29667
53103fc8ffa3 Replaced group_ and ring_simps by algebra_simps;
nipkow
parents: 29504
diff changeset
   862
    by (simp only: poly_minus poly_add algebra_simps) simp
53103fc8ffa3 Replaced group_ and ring_simps by algebra_simps;
nipkow
parents: 29504
diff changeset
   863
  hence "poly ((c#cs) +++ -- (d#ds)) = poly []" by(simp add:expand_fun_eq)
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   864
  hence "c = d \<and> list_all (\<lambda>x. x=0) ((cs +++ -- ds))"
29667
53103fc8ffa3 Replaced group_ and ring_simps by algebra_simps;
nipkow
parents: 29504
diff changeset
   865
    unfolding poly_zero by (simp add: poly_minus_def algebra_simps)
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   866
  hence "c = d \<and> (\<forall>x. poly (cs +++ -- ds) x = 0)"
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   867
    unfolding poly_zero[symmetric] by simp
29667
53103fc8ffa3 Replaced group_ and ring_simps by algebra_simps;
nipkow
parents: 29504
diff changeset
   868
  thus ?rhs  by (simp add: poly_minus poly_add algebra_simps expand_fun_eq)
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   869
next
29667
53103fc8ffa3 Replaced group_ and ring_simps by algebra_simps;
nipkow
parents: 29504
diff changeset
   870
  assume ?rhs then show ?lhs by(simp add:expand_fun_eq)
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   871
qed
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   872
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   873
lemma (in idom_char_0) pnormalize_unique: "poly p = poly q \<Longrightarrow> pnormalize p = pnormalize q"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   874
proof(induct q arbitrary: p)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   875
  case Nil thus ?case by (simp only: poly_zero lemma_degree_zero) simp
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   876
next
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   877
  case (Cons c cs p)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   878
  thus ?case
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   879
  proof(induct p)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   880
    case Nil
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   881
    hence "poly [] = poly (c#cs)" by blast
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   882
    then have "poly (c#cs) = poly [] " by simp
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   883
    thus ?case by (simp only: poly_zero lemma_degree_zero) simp
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   884
  next
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   885
    case (Cons d ds)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   886
    hence eq: "poly (d # ds) = poly (c # cs)" by blast
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   887
    hence eq': "\<And>x. poly (d # ds) x = poly (c # cs) x" by simp
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   888
    hence "poly (d # ds) 0 = poly (c # cs) 0" by blast
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   889
    hence dc: "d = c" by auto
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   890
    with eq have "poly ds = poly cs"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   891
      unfolding  poly_Cons_eq by simp
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   892
    with Cons.prems have "pnormalize ds = pnormalize cs" by blast
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   893
    with dc show ?case by simp
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   894
  qed
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   895
qed
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   896
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   897
lemma (in idom_char_0) degree_unique: assumes pq: "poly p = poly q"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   898
  shows "degree p = degree q"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   899
using pnormalize_unique[OF pq] unfolding degree_def by simp
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   900
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   901
lemma (in semiring_0) pnormalize_length: "length (pnormalize p) \<le> length p" by (induct p, auto)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   902
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   903
lemma (in semiring_0) last_linear_mul_lemma:
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   904
  "last ((a %* p) +++ (x#(b %* p))) = (if p=[] then x else b*last p)"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   905
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   906
apply (induct p arbitrary: a x b, auto)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   907
apply (subgoal_tac "padd (cmult aa p) (times b a # cmult b p) \<noteq> []", simp)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   908
apply (induct_tac p, auto)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   909
done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   910
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   911
lemma (in semiring_1) last_linear_mul: assumes p:"p\<noteq>[]" shows "last ([a,1] *** p) = last p"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   912
proof-
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   913
  from p obtain c cs where cs: "p = c#cs" by (cases p, auto)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   914
  from cs have eq:"[a,1] *** p = (a %* (c#cs)) +++ (0#(1 %* (c#cs)))"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   915
    by (simp add: poly_cmult_distr)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   916
  show ?thesis using cs
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   917
    unfolding eq last_linear_mul_lemma by simp
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   918
qed
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   919
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   920
lemma (in semiring_0) pnormalize_eq: "last p \<noteq> 0 \<Longrightarrow> pnormalize p = p"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   921
  apply (induct p, auto)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   922
  apply (case_tac p, auto)+
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   923
  done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   924
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   925
lemma (in semiring_0) last_pnormalize: "pnormalize p \<noteq> [] \<Longrightarrow> last (pnormalize p) \<noteq> 0"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   926
  by (induct p, auto)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   927
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   928
lemma (in semiring_0) pnormal_degree: "last p \<noteq> 0 \<Longrightarrow> degree p = length p - 1"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   929
  using pnormalize_eq[of p] unfolding degree_def by simp
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   930
26313
8590bf5ef343 avoid rebinding of existing facts;
wenzelm
parents: 26194
diff changeset
   931
lemma (in semiring_0) poly_Nil_ext: "poly [] = (\<lambda>x. 0)" by (rule ext) simp
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   932
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   933
lemma (in idom_char_0) linear_mul_degree: assumes p: "poly p \<noteq> poly []"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   934
  shows "degree ([a,1] *** p) = degree p + 1"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   935
proof-
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   936
  from p have pnz: "pnormalize p \<noteq> []"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   937
    unfolding poly_zero lemma_degree_zero .
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   938
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   939
  from last_linear_mul[OF pnz, of a] last_pnormalize[OF pnz]
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   940
  have l0: "last ([a, 1] *** pnormalize p) \<noteq> 0" by simp
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   941
  from last_pnormalize[OF pnz] last_linear_mul[OF pnz, of a]
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   942
    pnormal_degree[OF l0] pnormal_degree[OF last_pnormalize[OF pnz]] pnz
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   943
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   944
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   945
  have th: "degree ([a,1] *** pnormalize p) = degree (pnormalize p) + 1"
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   946
    by (auto simp add: poly_length_mult)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   947
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   948
  have eqs: "poly ([a,1] *** pnormalize p) = poly ([a,1] *** p)"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   949
    by (rule ext) (simp add: poly_mult poly_add poly_cmult)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   950
  from degree_unique[OF eqs] th
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   951
  show ?thesis by (simp add: degree_unique[OF poly_normalize])
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   952
qed
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   953
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   954
lemma (in idom_char_0) linear_pow_mul_degree:
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   955
  "degree([a,1] %^n *** p) = (if poly p = poly [] then 0 else degree p + n)"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   956
proof(induct n arbitrary: a p)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   957
  case (0 a p)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   958
  {assume p: "poly p = poly []"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   959
    hence ?case using degree_unique[OF p] by (simp add: degree_def)}
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   960
  moreover
26313
8590bf5ef343 avoid rebinding of existing facts;
wenzelm
parents: 26194
diff changeset
   961
  {assume p: "poly p \<noteq> poly []" hence ?case by (auto simp add: poly_Nil_ext) }
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   962
  ultimately show ?case by blast
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   963
next
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   964
  case (Suc n a p)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   965
  have eq: "poly ([a,1] %^(Suc n) *** p) = poly ([a,1] %^ n *** ([a,1] *** p))"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   966
    apply (rule ext, simp add: poly_mult poly_add poly_cmult)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   967
    by (simp add: mult_ac add_ac right_distrib)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   968
  note deq = degree_unique[OF eq]
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   969
  {assume p: "poly p = poly []"
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   970
    with eq have eq': "poly ([a,1] %^(Suc n) *** p) = poly []"
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   971
      by - (rule ext,simp add: poly_mult poly_cmult poly_add)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   972
    from degree_unique[OF eq'] p have ?case by (simp add: degree_def)}
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   973
  moreover
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   974
  {assume p: "poly p \<noteq> poly []"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   975
    from p have ap: "poly ([a,1] *** p) \<noteq> poly []"
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   976
      using poly_mult_not_eq_poly_Nil unfolding poly_entire by auto
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   977
    have eq: "poly ([a,1] %^(Suc n) *** p) = poly ([a,1]%^n *** ([a,1] *** p))"
29667
53103fc8ffa3 Replaced group_ and ring_simps by algebra_simps;
nipkow
parents: 29504
diff changeset
   978
     by (rule ext, simp add: poly_mult poly_add poly_exp poly_cmult algebra_simps)
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   979
   from ap have ap': "(poly ([a,1] *** p) = poly []) = False" by blast
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   980
   have  th0: "degree ([a,1]%^n *** ([a,1] *** p)) = degree ([a,1] *** p) + n"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   981
     apply (simp only: Suc.hyps[of a "pmult [a,one] p"] ap')
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   982
     by simp
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   983
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   984
   from degree_unique[OF eq] ap p th0 linear_mul_degree[OF p, of a]
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   985
   have ?case by (auto simp del: poly.simps)}
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   986
  ultimately show ?case by blast
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   987
qed
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   988
31021
53642251a04f farewell to class recpower
haftmann
parents: 30738
diff changeset
   989
lemma (in idom_char_0) order_degree:
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   990
  assumes p0: "poly p \<noteq> poly []"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   991
  shows "order a p \<le> degree p"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   992
proof-
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   993
  from order2[OF p0, unfolded divides_def]
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   994
  obtain q where q: "poly p = poly ([- a, 1]%^ (order a p) *** q)" by blast
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   995
  {assume "poly q = poly []"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   996
    with q p0 have False by (simp add: poly_mult poly_entire)}
30488
5c4c3a9e9102 remove trailing spaces
huffman
parents: 29879
diff changeset
   997
  with degree_unique[OF q, unfolded linear_pow_mul_degree]
26124
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   998
  show ?thesis by auto
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
   999
qed
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
  1000
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
  1001
text{*Tidier versions of finiteness of roots.*}
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
  1002
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
  1003
lemma (in idom_char_0) poly_roots_finite_set: "poly p \<noteq> poly [] ==> finite {x. poly p x = 0}"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
  1004
unfolding poly_roots_finite .
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
  1005
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
  1006
text{*bound for polynomial.*}
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
  1007
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
  1008
lemma poly_mono: "abs(x) \<le> k ==> abs(poly p (x::'a::{ordered_idom})) \<le> poly (map abs p) k"
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
  1009
apply (induct "p", auto)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
  1010
apply (rule_tac y = "abs a + abs (x * poly p x)" in order_trans)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
  1011
apply (rule abs_triangle_ineq)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
  1012
apply (auto intro!: mult_mono simp add: abs_mult)
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
  1013
done
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
  1014
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
  1015
lemma (in semiring_0) poly_Sing: "poly [c] x = c" by simp
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
  1016
2514f0ade8bc A library for univariate polynomials -- generalizes old Hyperreal/Poly.thy from reals to locales
chaieb
parents:
diff changeset
  1017
end