--- a/src/HOL/Hoare/Arith2.ML Wed Jun 07 00:57:14 2006 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,66 +0,0 @@
-(* Title: HOL/Hoare/Arith2.ML
- ID: $Id$
- Author: Norbert Galm
- Copyright 1995 TUM
-
-More arithmetic lemmas.
-*)
-
-(*** cd ***)
-
-Goalw [cd_def] "0<n ==> cd n n n";
-by (Asm_simp_tac 1);
-qed "cd_nnn";
-
-Goalw [cd_def] "[| cd x m n; 0<m; 0<n |] ==> x<=m & x<=n";
-by (blast_tac (claset() addIs [dvd_imp_le]) 1);
-qed "cd_le";
-
-Goalw [cd_def] "cd x m n = cd x n m";
-by (Fast_tac 1);
-qed "cd_swap";
-
-Goalw [cd_def] "n<=m ==> cd x m n = cd x (m-n) n";
-by (blast_tac (claset() addIs [dvd_diff] addDs [dvd_diffD]) 1);
-qed "cd_diff_l";
-
-Goalw [cd_def] "m<=n ==> cd x m n = cd x m (n-m)";
-by (blast_tac (claset() addIs [dvd_diff] addDs [dvd_diffD]) 1);
-qed "cd_diff_r";
-
-
-(*** gcd ***)
-
-Goalw [gcd_def] "0<n ==> n = gcd n n";
-by (ftac cd_nnn 1);
-by (rtac (some_equality RS sym) 1);
-by (blast_tac (claset() addDs [cd_le]) 1);
-by (blast_tac (claset() addIs [le_anti_sym] addDs [cd_le]) 1);
-qed "gcd_nnn";
-
-val prems = goalw (the_context ()) [gcd_def] "gcd m n = gcd n m";
-by (simp_tac (simpset() addsimps [cd_swap]) 1);
-qed "gcd_swap";
-
-Goalw [gcd_def] "n<=m ==> gcd m n = gcd (m-n) n";
-by (subgoal_tac "n<=m ==> !x. cd x m n = cd x (m-n) n" 1);
-by (Asm_simp_tac 1);
-by (rtac allI 1);
-by (etac cd_diff_l 1);
-qed "gcd_diff_l";
-
-Goalw [gcd_def] "m<=n ==> gcd m n = gcd m (n-m)";
-by (subgoal_tac "m<=n ==> !x. cd x m n = cd x m (n-m)" 1);
-by (Asm_simp_tac 1);
-by (rtac allI 1);
-by (etac cd_diff_r 1);
-qed "gcd_diff_r";
-
-
-(*** pow ***)
-
-Goal "m mod 2 = 0 ==> ((n::nat)*n)^(m div 2) = n^m";
-by (asm_simp_tac (simpset() addsimps [power2_eq_square RS sym,
- power_mult RS sym, mult_div_cancel]) 1);
-qed "sq_pow_div2";
-Addsimps [sq_pow_div2];