src/HOL/Groebner_Basis.thy
author chaieb
Mon, 11 Jun 2007 11:05:57 +0200
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explicitely depends on file groebner.ML
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(*  Title:      HOL/Groebner_Basis.thy
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    ID:         $Id$
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    Author:     Amine Chaieb, TU Muenchen
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*)
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header {* Semiring normalization and Groebner Bases *}
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theory Groebner_Basis
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imports NatBin
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uses
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  "Tools/Groebner_Basis/misc.ML"
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  "Tools/Groebner_Basis/normalizer_data.ML"
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  ("Tools/Groebner_Basis/normalizer.ML")
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  ("Tools/Groebner_Basis/groebner.ML")
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begin
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subsection {* Semiring normalization *}
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setup NormalizerData.setup
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locale gb_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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subsubsection {* Declaring the abstract theory *}
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lemma semiring_ops:
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  includes meta_term_syntax
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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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  by rule+
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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" by (simp add: nat_number pwr_Suc pwr_0 mul_1 mul_c)
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next show "mul x (add y z) = add (mul x y) (mul x z)" using mul_d by simp
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next show "pwr x (Suc q) = mul x (pwr x q)" using pwr_Suc by simp
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next show "pwr x (2 * n) = mul (pwr x n) (pwr x n)" by (simp add: nat_number mul_pwr)
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next show "pwr x (Suc (2 * n)) = mul x (mul (pwr x n) (pwr x n))"
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    by (simp add: nat_number pwr_Suc mul_pwr)
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qed
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lemma "axioms" [normalizer
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    semiring ops: semiring_ops
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    semiring rules: semiring_rules]:
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  "gb_semiring add mul pwr r0 r1" .
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end
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interpretation class_semiring: gb_semiring
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    ["op +" "op *" "op ^" "0::'a::{comm_semiring_1, recpower}" "1"]
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  by unfold_locales (auto simp add: ring_eq_simps power_Suc)
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lemmas nat_arith =
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  add_nat_number_of diff_nat_number_of mult_nat_number_of eq_nat_number_of less_nat_number_of
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lemma not_iszero_Numeral1: "\<not> iszero (Numeral1::'a::number_ring)"
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  by (simp add: numeral_1_eq_1)
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lemmas comp_arith = Let_def arith_simps nat_arith rel_simps if_False
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  if_True add_0 add_Suc add_number_of_left mult_number_of_left
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  numeral_1_eq_1[symmetric] Suc_eq_add_numeral_1
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  numeral_0_eq_0[symmetric] numerals[symmetric] not_iszero_1
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  iszero_number_of_1 iszero_number_of_0 nonzero_number_of_Min
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  iszero_number_of_Pls iszero_0 not_iszero_Numeral1
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lemmas semiring_norm = comp_arith
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ML {*
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  fun numeral_is_const ct =
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    can HOLogic.dest_number (Thm.term_of ct);
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  val numeral_conv =
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    Conv.then_conv (Simplifier.rewrite (HOL_basic_ss addsimps @{thms semiring_norm}),
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   Simplifier.rewrite (HOL_basic_ss addsimps
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  [@{thm numeral_1_eq_1},@{thm numeral_0_eq_0}] @ @{thms numerals(1-2)}));
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*}
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ML {*
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  fun int_of_rat x =
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    (case Rat.quotient_of_rat x of (i, 1) => i
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    | _ => error "int_of_rat: bad int")
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*}
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declaration {*
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  NormalizerData.funs @{thm class_semiring.axioms}
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   {is_const = fn phi => numeral_is_const,
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    dest_const = fn phi => fn ct =>
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      Rat.rat_of_int (snd
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        (HOLogic.dest_number (Thm.term_of ct)
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          handle TERM _ => error "ring_dest_const")),
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    mk_const = fn phi => fn cT => fn x =>
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      Thm.cterm_of (Thm.theory_of_ctyp cT) (HOLogic.mk_number (typ_of cT) (int_of_rat x)),
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    conv = fn phi => numeral_conv}
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*}
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locale gb_ring = gb_semiring +
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  fixes sub :: "'a \<Rightarrow> 'a \<Rightarrow> 'a"
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    and neg :: "'a \<Rightarrow> 'a"
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  assumes neg_mul: "neg x = mul (neg r1) x"
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    and sub_add: "sub x y = add x (neg y)"
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begin
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lemma ring_ops:
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  includes meta_term_syntax
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  shows "TERM (sub x y)" and "TERM (neg x)" .
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lemmas ring_rules = neg_mul sub_add
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lemma "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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  "gb_ring add mul pwr r0 r1 sub neg" .
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end
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interpretation class_ring: gb_ring ["op +" "op *" "op ^"
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    "0::'a::{comm_semiring_1,recpower,number_ring}" 1 "op -" "uminus"]
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  by unfold_locales simp_all
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declaration {*
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  NormalizerData.funs @{thm class_ring.axioms}
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   {is_const = fn phi => numeral_is_const,
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    dest_const = fn phi => fn ct =>
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      Rat.rat_of_int (snd
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        (HOLogic.dest_number (Thm.term_of ct)
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          handle TERM _ => error "ring_dest_const")),
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    mk_const = fn phi => fn cT => fn x =>
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      Thm.cterm_of (Thm.theory_of_ctyp cT) (HOLogic.mk_number (typ_of cT) (int_of_rat x)),
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    conv = fn phi => numeral_conv}
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*}
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use "Tools/Groebner_Basis/normalizer.ML"
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method_setup sring_norm = {*
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  Method.ctxt_args (fn ctxt => Method.SIMPLE_METHOD' (Normalizer.semiring_normalize_tac ctxt))
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*} "Semiring_normalizer"
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23266
50f0a4f12ed3 tuned document;
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subsection {* Groebner Bases *}
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locale semiringb = gb_semiring +
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  assumes add_cancel: "add (x::'a) y = add x z \<longleftrightarrow> y = z"
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  and add_mul_solve: "add (mul w y) (mul x z) =
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    add (mul w z) (mul x y) \<longleftrightarrow> w = x \<or> y = z"
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begin
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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)"
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proof-
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  have "a \<noteq> b \<and> c \<noteq> d \<longleftrightarrow> \<not> (a = b \<or> c = d)" by simp
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  also have "\<dots> \<longleftrightarrow> add (mul a c) (mul b d) \<noteq> add (mul a d) (mul b c)"
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    using add_mul_solve by blast
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  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)"
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    by simp
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qed
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lemma add_scale_eq_noteq: "\<lbrakk>r \<noteq> r0 ; (a = b) \<and> ~(c = d)\<rbrakk>
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  \<Longrightarrow> add a (mul r c) \<noteq> add b (mul r d)"
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proof(clarify)
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  assume nz: "r\<noteq> r0" and cnd: "c\<noteq>d"
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    and eq: "add b (mul r c) = add b (mul r d)"
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  hence "mul r c = mul r d" using cnd add_cancel by simp
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  hence "add (mul r0 d) (mul r c) = add (mul r0 c) (mul r d)"
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    using mul_0 add_cancel by simp
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  thus "False" using add_mul_solve nz cnd by simp
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qed
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declare "axioms" [normalizer del]
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lemma "axioms" [normalizer
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  semiring ops: semiring_ops
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  semiring rules: semiring_rules
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  idom rules: noteq_reduce add_scale_eq_noteq]:
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  "semiringb add mul pwr r0 r1" .
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end
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locale ringb = semiringb + gb_ring
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begin
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declare "axioms" [normalizer del]
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67268bb40b21 Semiring normalization and Groebner Bases.
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lemma "axioms" [normalizer
67268bb40b21 Semiring normalization and Groebner Bases.
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  semiring ops: semiring_ops
67268bb40b21 Semiring normalization and Groebner Bases.
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  semiring rules: semiring_rules
67268bb40b21 Semiring normalization and Groebner Bases.
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  ring ops: ring_ops
67268bb40b21 Semiring normalization and Groebner Bases.
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  ring rules: ring_rules
67268bb40b21 Semiring normalization and Groebner Bases.
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  idom rules: noteq_reduce add_scale_eq_noteq]:
67268bb40b21 Semiring normalization and Groebner Bases.
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  "ringb add mul pwr r0 r1 sub neg" .
67268bb40b21 Semiring normalization and Groebner Bases.
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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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   315
67268bb40b21 Semiring normalization and Groebner Bases.
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   316
lemma no_zero_divirors_neq0:
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  assumes az: "(a::'a::no_zero_divisors) \<noteq> 0"
67268bb40b21 Semiring normalization and Groebner Bases.
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   318
    and ab: "a*b = 0" shows "b = 0"
67268bb40b21 Semiring normalization and Groebner Bases.
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   319
proof -
67268bb40b21 Semiring normalization and Groebner Bases.
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   320
  { assume bz: "b \<noteq> 0"
67268bb40b21 Semiring normalization and Groebner Bases.
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   321
    from no_zero_divisors [OF az bz] ab have False by blast }
67268bb40b21 Semiring normalization and Groebner Bases.
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   322
  thus "b = 0" by blast
67268bb40b21 Semiring normalization and Groebner Bases.
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   323
qed
67268bb40b21 Semiring normalization and Groebner Bases.
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   324
67268bb40b21 Semiring normalization and Groebner Bases.
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   325
interpretation class_ringb: ringb
67268bb40b21 Semiring normalization and Groebner Bases.
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   326
  ["op +" "op *" "op ^" "0::'a::{idom,recpower,number_ring}" "1" "op -" "uminus"]
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
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   327
proof(unfold_locales, simp add: ring_eq_simps power_Suc, auto)
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
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   328
  fix w x y z ::"'a::{idom,recpower,number_ring}"
67268bb40b21 Semiring normalization and Groebner Bases.
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   329
  assume p: "w * y + x * z = w * z + x * y" and ynz: "y \<noteq> z"
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
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   330
  hence ynz': "y - z \<noteq> 0" by simp
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   331
  from p have "w * y + x* z - w*z - x*y = 0" by simp
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
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   332
  hence "w* (y - z) - x * (y - z) = 0" by (simp add: ring_eq_simps)
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   333
  hence "(y - z) * (w - x) = 0" by (simp add: ring_eq_simps)
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
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   334
  with  no_zero_divirors_neq0 [OF ynz']
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
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   335
  have "w - x = 0" by blast
67268bb40b21 Semiring normalization and Groebner Bases.
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   336
  thus "w = x"  by simp
67268bb40b21 Semiring normalization and Groebner Bases.
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   337
qed
67268bb40b21 Semiring normalization and Groebner Bases.
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diff changeset
   338
67268bb40b21 Semiring normalization and Groebner Bases.
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   339
67268bb40b21 Semiring normalization and Groebner Bases.
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declaration {*
67268bb40b21 Semiring normalization and Groebner Bases.
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   341
  NormalizerData.funs @{thm class_ringb.axioms}
67268bb40b21 Semiring normalization and Groebner Bases.
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   342
   {is_const = fn phi => numeral_is_const,
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   343
    dest_const = fn phi => fn ct =>
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      Rat.rat_of_int (snd
67268bb40b21 Semiring normalization and Groebner Bases.
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   345
        (HOLogic.dest_number (Thm.term_of ct)
67268bb40b21 Semiring normalization and Groebner Bases.
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   346
          handle TERM _ => error "ring_dest_const")),
67268bb40b21 Semiring normalization and Groebner Bases.
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   347
    mk_const = fn phi => fn cT => fn x =>
67268bb40b21 Semiring normalization and Groebner Bases.
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   348
      Thm.cterm_of (Thm.theory_of_ctyp cT) (HOLogic.mk_number (typ_of cT) (int_of_rat x)),
67268bb40b21 Semiring normalization and Groebner Bases.
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   349
    conv = fn phi => numeral_conv}
67268bb40b21 Semiring normalization and Groebner Bases.
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   350
*}
67268bb40b21 Semiring normalization and Groebner Bases.
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   351
67268bb40b21 Semiring normalization and Groebner Bases.
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   352
67268bb40b21 Semiring normalization and Groebner Bases.
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   353
interpretation natgb: semiringb
67268bb40b21 Semiring normalization and Groebner Bases.
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   354
  ["op +" "op *" "op ^" "0::nat" "1"]
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
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   355
proof (unfold_locales, simp add: ring_eq_simps power_Suc)
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
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diff changeset
   356
  fix w x y z ::"nat"
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
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diff changeset
   357
  { assume p: "w * y + x * z = w * z + x * y" and ynz: "y \<noteq> z"
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   358
    hence "y < z \<or> y > z" by arith
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   359
    moreover {
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
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diff changeset
   360
      assume lt:"y <z" hence "\<exists>k. z = y + k \<and> k > 0" by (rule_tac x="z - y" in exI, auto)
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   361
      then obtain k where kp: "k>0" and yz:"z = y + k" by blast
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   362
      from p have "(w * y + x *y) + x*k = (w * y + x*y) + w*k" by (simp add: yz ring_eq_simps)
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   363
      hence "x*k = w*k" by simp
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   364
      hence "w = x" using kp by (simp add: mult_cancel2) }
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   365
    moreover {
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   366
      assume lt: "y >z" hence "\<exists>k. y = z + k \<and> k>0" by (rule_tac x="y - z" in exI, auto)
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   367
      then obtain k where kp: "k>0" and yz:"y = z + k" by blast
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   368
      from p have "(w * z + x *z) + w*k = (w * z + x*z) + x*k" by (simp add: yz ring_eq_simps)
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   369
      hence "w*k = x*k" by simp
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   370
      hence "w = x" using kp by (simp add: mult_cancel2)}
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   371
    ultimately have "w=x" by blast }
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   372
  thus "(w * y + x * z = w * z + x * y) = (w = x \<or> y = z)" by auto
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   373
qed
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   374
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   375
declaration {*
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   376
  NormalizerData.funs @{thm natgb.axioms}
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   377
   {is_const = fn phi => numeral_is_const,
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   378
    dest_const = fn phi => fn ct =>
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   379
      Rat.rat_of_int (snd
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   380
        (HOLogic.dest_number (Thm.term_of ct)
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   381
          handle TERM _ => error "ring_dest_const")),
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   382
    mk_const = fn phi => fn cT => fn x =>
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   383
      Thm.cterm_of (Thm.theory_of_ctyp cT) (HOLogic.mk_number (typ_of cT) (int_of_rat x)),
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   384
    conv = fn phi => numeral_conv}
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   385
*}
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   386
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   387
23258
9062e98fdab1 renamed locale ring/semiring to gb_ring/gb_semiring to avoid clash with Ring_and_Field versions;
wenzelm
parents: 23252
diff changeset
   388
lemmas bool_simps = simp_thms(1-34)
23252
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   389
lemma dnf:
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   390
    "(P & (Q | R)) = ((P&Q) | (P&R))" "((Q | R) & P) = ((Q&P) | (R&P))"
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   391
    "(P \<and> Q) = (Q \<and> P)" "(P \<or> Q) = (Q \<or> P)"
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   392
  by blast+
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   393
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   394
lemmas weak_dnf_simps = dnf bool_simps
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   395
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   396
lemma nnf_simps:
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   397
    "(\<not>(P \<and> Q)) = (\<not>P \<or> \<not>Q)" "(\<not>(P \<or> Q)) = (\<not>P \<and> \<not>Q)" "(P \<longrightarrow> Q) = (\<not>P \<or> Q)"
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   398
    "(P = Q) = ((P \<and> Q) \<or> (\<not>P \<and> \<not> Q))" "(\<not> \<not>(P)) = P"
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   399
  by blast+
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   400
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   401
lemma PFalse:
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   402
    "P \<equiv> False \<Longrightarrow> \<not> P"
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   403
    "\<not> P \<Longrightarrow> (P \<equiv> False)"
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   404
  by auto
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   405
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   406
use "Tools/Groebner_Basis/groebner.ML"
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   407
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   408
ML {*
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   409
  fun algebra_tac ctxt i = ObjectLogic.full_atomize_tac i THEN (fn st =>
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   410
  rtac (Groebner.ring_conv ctxt (Thm.dest_arg (nth (cprems_of st) (i - 1)))) i st);
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   411
*}
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   412
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   413
method_setup algebra = {*
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   414
  Method.ctxt_args (Method.SIMPLE_METHOD' o algebra_tac)
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   415
*} ""
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   416
67268bb40b21 Semiring normalization and Groebner Bases.
wenzelm
parents:
diff changeset
   417
end