src/HOL/Semiring_Normalization.thy
author haftmann
Fri, 07 May 2010 15:05:52 +0200
changeset 36751 7f1da69cacb3
parent 36720 src/HOL/Groebner_Basis.thy@41da7025e59c
child 36753 5cf4e9128f22
permissions -rw-r--r--
split of semiring normalization from Groebner theory; moved field_comp_conv to Numeral_Simproces
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(*  Title:      HOL/Semiring_Normalization.thy
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    Author:     Amine Chaieb, TU Muenchen
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*)
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header {* Semiring normalization *}
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theory Semiring_Normalization
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imports Numeral_Simprocs Nat_Transfer
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uses
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  "Tools/Groebner_Basis/normalizer.ML"
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begin
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setup Normalizer.setup
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locale normalizing_semiring =
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  fixes add mul pwr r0 r1
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  assumes add_a:"(add x (add y z) = add (add x y) z)"
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    and add_c: "add x y = add y x" and add_0:"add r0 x = x"
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    and mul_a:"mul x (mul y z) = mul (mul x y) z" and mul_c:"mul x y = mul y x"
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    and mul_1:"mul r1 x = x" and  mul_0:"mul r0 x = r0"
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    and mul_d:"mul x (add y z) = add (mul x y) (mul x z)"
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    and pwr_0:"pwr x 0 = r1" and pwr_Suc:"pwr x (Suc n) = mul x (pwr x n)"
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begin
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lemma mul_pwr:"mul (pwr x p) (pwr x q) = pwr x (p + q)"
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proof (induct p)
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  case 0
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  then show ?case by (auto simp add: pwr_0 mul_1)
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next
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  case Suc
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  from this [symmetric] show ?case
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    by (auto simp add: pwr_Suc mul_1 mul_a)
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qed
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lemma pwr_mul: "pwr (mul x y) q = mul (pwr x q) (pwr y q)"
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proof (induct q arbitrary: x y, auto simp add:pwr_0 pwr_Suc mul_1)
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  fix q x y
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  assume "\<And>x y. pwr (mul x y) q = mul (pwr x q) (pwr y q)"
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  have "mul (mul x y) (mul (pwr x q) (pwr y q)) = mul x (mul y (mul (pwr x q) (pwr y q)))"
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    by (simp add: mul_a)
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  also have "\<dots> = (mul (mul y (mul (pwr y q) (pwr x q))) x)" by (simp add: mul_c)
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  also have "\<dots> = (mul (mul y (pwr y q)) (mul (pwr x q) x))" by (simp add: mul_a)
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  finally show "mul (mul x y) (mul (pwr x q) (pwr y q)) =
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    mul (mul x (pwr x q)) (mul y (pwr y q))" by (simp add: mul_c)
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qed
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lemma pwr_pwr: "pwr (pwr x p) q = pwr x (p * q)"
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proof (induct p arbitrary: q)
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  case 0
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  show ?case using pwr_Suc mul_1 pwr_0 by (induct q) auto
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next
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  case Suc
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  thus ?case by (auto simp add: mul_pwr [symmetric] pwr_mul pwr_Suc)
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qed
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lemma semiring_ops:
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  shows "TERM (add x y)" and "TERM (mul x y)" and "TERM (pwr x n)"
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    and "TERM r0" and "TERM r1" .
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lemma semiring_rules:
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  "add (mul a m) (mul b m) = mul (add a b) m"
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  "add (mul a m) m = mul (add a r1) m"
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  "add m (mul a m) = mul (add a r1) m"
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  "add m m = mul (add r1 r1) m"
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  "add r0 a = a"
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  "add a r0 = a"
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  "mul a b = mul b a"
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  "mul (add a b) c = add (mul a c) (mul b c)"
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  "mul r0 a = r0"
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  "mul a r0 = r0"
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  "mul r1 a = a"
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  "mul a r1 = a"
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  "mul (mul lx ly) (mul rx ry) = mul (mul lx rx) (mul ly ry)"
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  "mul (mul lx ly) (mul rx ry) = mul lx (mul ly (mul rx ry))"
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  "mul (mul lx ly) (mul rx ry) = mul rx (mul (mul lx ly) ry)"
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  "mul (mul lx ly) rx = mul (mul lx rx) ly"
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  "mul (mul lx ly) rx = mul lx (mul ly rx)"
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  "mul lx (mul rx ry) = mul (mul lx rx) ry"
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  "mul lx (mul rx ry) = mul rx (mul lx ry)"
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  "add (add a b) (add c d) = add (add a c) (add b d)"
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  "add (add a b) c = add a (add b c)"
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  "add a (add c d) = add c (add a d)"
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  "add (add a b) c = add (add a c) b"
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  "add a c = add c a"
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  "add a (add c d) = add (add a c) d"
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  "mul (pwr x p) (pwr x q) = pwr x (p + q)"
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  "mul x (pwr x q) = pwr x (Suc q)"
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  "mul (pwr x q) x = pwr x (Suc q)"
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  "mul x x = pwr x 2"
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  "pwr (mul x y) q = mul (pwr x q) (pwr y q)"
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  "pwr (pwr x p) q = pwr x (p * q)"
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  "pwr x 0 = r1"
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  "pwr x 1 = x"
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  "mul x (add y z) = add (mul x y) (mul x z)"
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  "pwr x (Suc q) = mul x (pwr x q)"
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  "pwr x (2*n) = mul (pwr x n) (pwr x n)"
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  "pwr x (Suc (2*n)) = mul x (mul (pwr x n) (pwr x n))"
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proof -
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  show "add (mul a m) (mul b m) = mul (add a b) m" using mul_d mul_c by simp
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next show"add (mul a m) m = mul (add a r1) m" using mul_d mul_c mul_1 by simp
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next show "add m (mul a m) = mul (add a r1) m" using mul_c mul_d mul_1 add_c by simp
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next show "add m m = mul (add r1 r1) m" using mul_c mul_d mul_1 by simp
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next show "add r0 a = a" using add_0 by simp
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next show "add a r0 = a" using add_0 add_c by simp
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next show "mul a b = mul b a" using mul_c by simp
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next show "mul (add a b) c = add (mul a c) (mul b c)" using mul_c mul_d by simp
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next show "mul r0 a = r0" using mul_0 by simp
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next show "mul a r0 = r0" using mul_0 mul_c by simp
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next show "mul r1 a = a" using mul_1 by simp
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next show "mul a r1 = a" using mul_1 mul_c by simp
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next show "mul (mul lx ly) (mul rx ry) = mul (mul lx rx) (mul ly ry)"
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    using mul_c mul_a by simp
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next show "mul (mul lx ly) (mul rx ry) = mul lx (mul ly (mul rx ry))"
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    using mul_a by simp
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next
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  have "mul (mul lx ly) (mul rx ry) = mul (mul rx ry) (mul lx ly)" by (rule mul_c)
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  also have "\<dots> = mul rx (mul ry (mul lx ly))" using mul_a by simp
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  finally
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  show "mul (mul lx ly) (mul rx ry) = mul rx (mul (mul lx ly) ry)"
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    using mul_c by simp
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next show "mul (mul lx ly) rx = mul (mul lx rx) ly" using mul_c mul_a by simp
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next
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  show "mul (mul lx ly) rx = mul lx (mul ly rx)" by (simp add: mul_a)
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next show "mul lx (mul rx ry) = mul (mul lx rx) ry" by (simp add: mul_a )
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next show "mul lx (mul rx ry) = mul rx (mul lx ry)" by (simp add: mul_a,simp add: mul_c)
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next show "add (add a b) (add c d) = add (add a c) (add b d)"
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    using add_c add_a by simp
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next show "add (add a b) c = add a (add b c)" using add_a by simp
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next show "add a (add c d) = add c (add a d)"
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    apply (simp add: add_a) by (simp only: add_c)
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next show "add (add a b) c = add (add a c) b" using add_a add_c by simp
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next show "add a c = add c a" by (rule add_c)
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next show "add a (add c d) = add (add a c) d" using add_a by simp
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next show "mul (pwr x p) (pwr x q) = pwr x (p + q)" by (rule mul_pwr)
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next show "mul x (pwr x q) = pwr x (Suc q)" using pwr_Suc by simp
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next show "mul (pwr x q) x = pwr x (Suc q)" using pwr_Suc mul_c by simp
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next show "mul x x = pwr x 2" by (simp add: nat_number' pwr_Suc pwr_0 mul_1 mul_c)
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next show "pwr (mul x y) q = mul (pwr x q) (pwr y q)" by (rule pwr_mul)
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next show "pwr (pwr x p) q = pwr x (p * q)" by (rule pwr_pwr)
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next show "pwr x 0 = r1" using pwr_0 .
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next show "pwr x 1 = x" unfolding One_nat_def by (simp add: nat_number' pwr_Suc pwr_0 mul_1 mul_c)
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parents:
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   142
next show "mul x (add y z) = add (mul x y) (mul x z)" using mul_d by simp
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
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   143
next show "pwr x (Suc q) = mul x (pwr x q)" using pwr_Suc by simp
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parents: 35092
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   144
next show "pwr x (2 * n) = mul (pwr x n) (pwr x n)" by (simp add: nat_number' mul_pwr)
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parents:
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   145
next show "pwr x (Suc (2 * n)) = mul x (mul (pwr x n) (pwr x n))"
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parents: 35092
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   146
    by (simp add: nat_number' pwr_Suc mul_pwr)
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parents:
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   147
qed
67268bb40b21 Semiring normalization and Groebner Bases.
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parents:
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   148
67268bb40b21 Semiring normalization and Groebner Bases.
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parents:
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   149
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lemmas normalizing_semiring_axioms' =
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  normalizing_semiring_axioms [normalizer
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    semiring ops: semiring_ops
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    semiring rules: semiring_rules]
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67268bb40b21 Semiring normalization and Groebner Bases.
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end
67268bb40b21 Semiring normalization and Groebner Bases.
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parents:
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   156
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   157
sublocale comm_semiring_1
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  < normalizing!: normalizing_semiring plus times power zero one
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   159
proof
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   160
qed (simp_all add: algebra_simps)
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   161
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declaration {* Normalizer.semiring_funs @{thm normalizing.normalizing_semiring_axioms'} *}
23573
d85a277f90fd common normalizer_funs, avoid cterm_of;
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parents: 23477
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   163
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locale normalizing_ring = normalizing_semiring +
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  fixes sub :: "'a \<Rightarrow> 'a \<Rightarrow> 'a"
67268bb40b21 Semiring normalization and Groebner Bases.
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   166
    and neg :: "'a \<Rightarrow> 'a"
67268bb40b21 Semiring normalization and Groebner Bases.
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  assumes neg_mul: "neg x = mul (neg r1) x"
67268bb40b21 Semiring normalization and Groebner Bases.
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    and sub_add: "sub x y = add x (neg y)"
67268bb40b21 Semiring normalization and Groebner Bases.
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   169
begin
67268bb40b21 Semiring normalization and Groebner Bases.
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   170
28856
5e009a80fe6d Pure syntax: more coherent treatment of aprop, permanent TERM and &&&;
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lemma ring_ops: shows "TERM (sub x y)" and "TERM (neg x)" .
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   172
67268bb40b21 Semiring normalization and Groebner Bases.
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lemmas ring_rules = neg_mul sub_add
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   174
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lemmas normalizing_ring_axioms' =
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  normalizing_ring_axioms [normalizer
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    semiring ops: semiring_ops
9c39fc898fff avoid rebinding of existing facts;
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    semiring rules: semiring_rules
9c39fc898fff avoid rebinding of existing facts;
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    ring ops: ring_ops
9c39fc898fff avoid rebinding of existing facts;
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    ring rules: ring_rules]
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   181
67268bb40b21 Semiring normalization and Groebner Bases.
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   182
end
67268bb40b21 Semiring normalization and Groebner Bases.
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   183
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sublocale comm_ring_1
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  < normalizing!: normalizing_ring plus times power zero one minus uminus
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   186
proof
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   187
qed (simp_all add: diff_minus)
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   188
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declaration {* Normalizer.semiring_funs @{thm normalizing.normalizing_ring_axioms'} *}
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parents:
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   190
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   191
locale normalizing_field = normalizing_ring +
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   192
  fixes divide :: "'a \<Rightarrow> 'a \<Rightarrow> 'a"
1654013ec97c Added instantiation of algebra method to fields
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parents: 23312
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   193
    and inverse:: "'a \<Rightarrow> 'a"
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dd5117e2d73e now deals with devision in fields
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parents: 30729
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   194
  assumes divide_inverse: "divide x y = mul x (inverse y)"
dd5117e2d73e now deals with devision in fields
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   195
     and inverse_divide: "inverse x = divide r1 x"
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parents: 23312
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   196
begin
1654013ec97c Added instantiation of algebra method to fields
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parents: 23312
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   197
30866
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   198
lemma field_ops: shows "TERM (divide x y)" and "TERM (inverse x)" .
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   199
dd5117e2d73e now deals with devision in fields
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   200
lemmas field_rules = divide_inverse inverse_divide
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chaieb
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   201
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lemmas normalizing_field_axioms' =
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   203
  normalizing_field_axioms [normalizer
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parents: 26199
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   204
    semiring ops: semiring_ops
9c39fc898fff avoid rebinding of existing facts;
wenzelm
parents: 26199
diff changeset
   205
    semiring rules: semiring_rules
9c39fc898fff avoid rebinding of existing facts;
wenzelm
parents: 26199
diff changeset
   206
    ring ops: ring_ops
30866
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chaieb
parents: 30729
diff changeset
   207
    ring rules: ring_rules
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chaieb
parents: 30729
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   208
    field ops: field_ops
dd5117e2d73e now deals with devision in fields
chaieb
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   209
    field rules: field_rules]
23327
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parents: 23312
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   210
1654013ec97c Added instantiation of algebra method to fields
chaieb
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   211
end
1654013ec97c Added instantiation of algebra method to fields
chaieb
parents: 23312
diff changeset
   212
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diff changeset
   213
locale normalizing_semiring_cancel = normalizing_semiring +
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parents:
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   214
  assumes add_cancel: "add (x::'a) y = add x z \<longleftrightarrow> y = z"
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   215
  and add_mul_solve: "add (mul w y) (mul x z) =
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   216
    add (mul w z) (mul x y) \<longleftrightarrow> w = x \<or> y = z"
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   217
begin
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   218
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
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   219
lemma noteq_reduce: "a \<noteq> b \<and> c \<noteq> d \<longleftrightarrow> add (mul a c) (mul b d) \<noteq> add (mul a d) (mul b c)"
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   220
proof-
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   221
  have "a \<noteq> b \<and> c \<noteq> d \<longleftrightarrow> \<not> (a = b \<or> c = d)" by simp
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   222
  also have "\<dots> \<longleftrightarrow> add (mul a c) (mul b d) \<noteq> add (mul a d) (mul b c)"
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   223
    using add_mul_solve by blast
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   224
  finally show "a \<noteq> b \<and> c \<noteq> d \<longleftrightarrow> add (mul a c) (mul b d) \<noteq> add (mul a d) (mul b c)"
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   225
    by simp
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   226
qed
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   227
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   228
lemma add_scale_eq_noteq: "\<lbrakk>r \<noteq> r0 ; (a = b) \<and> ~(c = d)\<rbrakk>
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   229
  \<Longrightarrow> add a (mul r c) \<noteq> add b (mul r d)"
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   230
proof(clarify)
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   231
  assume nz: "r\<noteq> r0" and cnd: "c\<noteq>d"
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   232
    and eq: "add b (mul r c) = add b (mul r d)"
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   233
  hence "mul r c = mul r d" using cnd add_cancel by simp
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   234
  hence "add (mul r0 d) (mul r c) = add (mul r0 c) (mul r d)"
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   235
    using mul_0 add_cancel by simp
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   236
  thus "False" using add_mul_solve nz cnd by simp
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   237
qed
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   238
25250
b3a485b98963 (1) added axiom to ringb and theorems to enable algebra to prove the ideal membership problem; (2) Method algebra now calls algebra_tac which first tries to solve a universal formula, then in case of failure trie to solve the ideal membership problem (see HOL/Tools/Groebner_Basis/groebner.ML)
chaieb
parents: 23573
diff changeset
   239
lemma add_r0_iff: " x = add x a \<longleftrightarrow> a = r0"
b3a485b98963 (1) added axiom to ringb and theorems to enable algebra to prove the ideal membership problem; (2) Method algebra now calls algebra_tac which first tries to solve a universal formula, then in case of failure trie to solve the ideal membership problem (see HOL/Tools/Groebner_Basis/groebner.ML)
chaieb
parents: 23573
diff changeset
   240
proof-
b3a485b98963 (1) added axiom to ringb and theorems to enable algebra to prove the ideal membership problem; (2) Method algebra now calls algebra_tac which first tries to solve a universal formula, then in case of failure trie to solve the ideal membership problem (see HOL/Tools/Groebner_Basis/groebner.ML)
chaieb
parents: 23573
diff changeset
   241
  have "a = r0 \<longleftrightarrow> add x a = add x r0" by (simp add: add_cancel)
b3a485b98963 (1) added axiom to ringb and theorems to enable algebra to prove the ideal membership problem; (2) Method algebra now calls algebra_tac which first tries to solve a universal formula, then in case of failure trie to solve the ideal membership problem (see HOL/Tools/Groebner_Basis/groebner.ML)
chaieb
parents: 23573
diff changeset
   242
  thus "x = add x a \<longleftrightarrow> a = r0" by (auto simp add: add_c add_0)
b3a485b98963 (1) added axiom to ringb and theorems to enable algebra to prove the ideal membership problem; (2) Method algebra now calls algebra_tac which first tries to solve a universal formula, then in case of failure trie to solve the ideal membership problem (see HOL/Tools/Groebner_Basis/groebner.ML)
chaieb
parents: 23573
diff changeset
   243
qed
b3a485b98963 (1) added axiom to ringb and theorems to enable algebra to prove the ideal membership problem; (2) Method algebra now calls algebra_tac which first tries to solve a universal formula, then in case of failure trie to solve the ideal membership problem (see HOL/Tools/Groebner_Basis/groebner.ML)
chaieb
parents: 23573
diff changeset
   244
36712
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   245
declare normalizing_semiring_axioms' [normalizer del]
23252
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parents:
diff changeset
   246
36712
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   247
lemmas normalizing_semiring_cancel_axioms' =
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parents: 36702
diff changeset
   248
  normalizing_semiring_cancel_axioms [normalizer
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diff changeset
   249
    semiring ops: semiring_ops
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diff changeset
   250
    semiring rules: semiring_rules
2f4c318861b3 avoid references to groebner bases in names which have no references to groebner bases
haftmann
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diff changeset
   251
    idom rules: noteq_reduce add_scale_eq_noteq]
23252
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   252
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
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diff changeset
   253
end
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   254
36712
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   255
locale normalizing_ring_cancel = normalizing_semiring_cancel + normalizing_ring + 
25250
b3a485b98963 (1) added axiom to ringb and theorems to enable algebra to prove the ideal membership problem; (2) Method algebra now calls algebra_tac which first tries to solve a universal formula, then in case of failure trie to solve the ideal membership problem (see HOL/Tools/Groebner_Basis/groebner.ML)
chaieb
parents: 23573
diff changeset
   256
  assumes subr0_iff: "sub x y = r0 \<longleftrightarrow> x = y"
23252
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   257
begin
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   258
36712
2f4c318861b3 avoid references to groebner bases in names which have no references to groebner bases
haftmann
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   259
declare normalizing_ring_axioms' [normalizer del]
23252
67268bb40b21 Semiring normalization and Groebner Bases.
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diff changeset
   260
36712
2f4c318861b3 avoid references to groebner bases in names which have no references to groebner bases
haftmann
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diff changeset
   261
lemmas normalizing_ring_cancel_axioms' = normalizing_ring_cancel_axioms [normalizer
23252
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   262
  semiring ops: semiring_ops
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   263
  semiring rules: semiring_rules
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   264
  ring ops: ring_ops
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   265
  ring rules: ring_rules
25250
b3a485b98963 (1) added axiom to ringb and theorems to enable algebra to prove the ideal membership problem; (2) Method algebra now calls algebra_tac which first tries to solve a universal formula, then in case of failure trie to solve the ideal membership problem (see HOL/Tools/Groebner_Basis/groebner.ML)
chaieb
parents: 23573
diff changeset
   266
  idom rules: noteq_reduce add_scale_eq_noteq
26314
9c39fc898fff avoid rebinding of existing facts;
wenzelm
parents: 26199
diff changeset
   267
  ideal rules: subr0_iff add_r0_iff]
23252
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   268
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   269
end
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   270
36720
41da7025e59c proper sublocales; no free-floating ML sections
haftmann
parents: 36716
diff changeset
   271
sublocale idom
41da7025e59c proper sublocales; no free-floating ML sections
haftmann
parents: 36716
diff changeset
   272
  < normalizing!: normalizing_ring_cancel plus times power zero one minus uminus
41da7025e59c proper sublocales; no free-floating ML sections
haftmann
parents: 36716
diff changeset
   273
proof
41da7025e59c proper sublocales; no free-floating ML sections
haftmann
parents: 36716
diff changeset
   274
  fix w x y z
41da7025e59c proper sublocales; no free-floating ML sections
haftmann
parents: 36716
diff changeset
   275
  show "w * y + x * z = w * z + x * y \<longleftrightarrow> w = x \<or> y = z"
41da7025e59c proper sublocales; no free-floating ML sections
haftmann
parents: 36716
diff changeset
   276
  proof
41da7025e59c proper sublocales; no free-floating ML sections
haftmann
parents: 36716
diff changeset
   277
    assume "w * y + x * z = w * z + x * y"
41da7025e59c proper sublocales; no free-floating ML sections
haftmann
parents: 36716
diff changeset
   278
    then have "w * y + x * z - w * z - x * y = 0" by (simp add: algebra_simps)
41da7025e59c proper sublocales; no free-floating ML sections
haftmann
parents: 36716
diff changeset
   279
    then have "w * (y - z) - x * (y - z) = 0" by (simp add: algebra_simps)
41da7025e59c proper sublocales; no free-floating ML sections
haftmann
parents: 36716
diff changeset
   280
    then have "(y - z) * (w - x) = 0" by (simp add: algebra_simps)
41da7025e59c proper sublocales; no free-floating ML sections
haftmann
parents: 36716
diff changeset
   281
    then have "y - z = 0 \<or> w - x = 0" by (rule divisors_zero)
41da7025e59c proper sublocales; no free-floating ML sections
haftmann
parents: 36716
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    then show "w = x \<or> y = z" by auto
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  qed (auto simp add: add_ac)
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qed (simp_all add: algebra_simps)
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declaration {* Normalizer.semiring_funs @{thm normalizing.normalizing_ring_cancel_axioms'} *}
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interpretation normalizing_nat!: normalizing_semiring_cancel
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  "op +" "op *" "op ^" "0::nat" "1"
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proof (unfold_locales, simp add: algebra_simps)
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  fix w x y z ::"nat"
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  { assume p: "w * y + x * z = w * z + x * y" and ynz: "y \<noteq> z"
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    hence "y < z \<or> y > z" by arith
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    moreover {
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      assume lt:"y <z" hence "\<exists>k. z = y + k \<and> k > 0" by (rule_tac x="z - y" in exI, auto)
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      then obtain k where kp: "k>0" and yz:"z = y + k" by blast
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      from p have "(w * y + x *y) + x*k = (w * y + x*y) + w*k" by (simp add: yz algebra_simps)
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      hence "x*k = w*k" by simp
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      hence "w = x" using kp by simp }
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    moreover {
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      assume lt: "y >z" hence "\<exists>k. y = z + k \<and> k>0" by (rule_tac x="y - z" in exI, auto)
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      then obtain k where kp: "k>0" and yz:"y = z + k" by blast
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      from p have "(w * z + x *z) + w*k = (w * z + x*z) + x*k" by (simp add: yz algebra_simps)
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      hence "w*k = x*k" by simp
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      hence "w = x" using kp by simp }
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    ultimately have "w=x" by blast }
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  thus "(w * y + x * z = w * z + x * y) = (w = x \<or> y = z)" by auto
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qed
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declaration {* Normalizer.semiring_funs @{thm normalizing_nat.normalizing_semiring_cancel_axioms'} *}
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locale normalizing_field_cancel = normalizing_ring_cancel + normalizing_field
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begin
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declare normalizing_field_axioms' [normalizer del]
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lemmas normalizing_field_cancel_axioms' = normalizing_field_cancel_axioms [normalizer
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  semiring ops: semiring_ops
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  semiring rules: semiring_rules
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  ring ops: ring_ops
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  ring rules: ring_rules
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  field ops: field_ops
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  field rules: field_rules
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  idom rules: noteq_reduce add_scale_eq_noteq
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  ideal rules: subr0_iff add_r0_iff]
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end
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sublocale field 
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  < normalizing!: normalizing_field_cancel plus times power zero one minus uminus divide inverse
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proof
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qed (simp_all add: divide_inverse)
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declaration {* Normalizer.field_funs @{thm normalizing.normalizing_field_cancel_axioms'} *}
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end