author | berghofe |
Fri, 24 Jul 1998 13:39:47 +0200 | |
changeset 5191 | 8ceaa19f7717 |
parent 5184 | 9b8547a9496a |
child 5223 | 4cb05273f764 |
permissions | -rw-r--r-- |
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(* Title: HOL/ex/Perm.ML |
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ID: $Id$ |
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Author: Lawrence C Paulson, Cambridge University Computer Laboratory |
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Copyright 1995 University of Cambridge |
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Permutations: example of an inductive definition |
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*) |
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(*It would be nice to prove |
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xs <~~> ys = (!x. count xs x = count ys x) |
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See mset on HOL/ex/Sorting.thy |
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*) |
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open Perm; |
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Goal "l <~~> l"; |
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by (induct_tac "l" 1); |
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by (REPEAT (ares_tac perm.intrs 1)); |
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qed "perm_refl"; |
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(** Some examples of rule induction on permutations **) |
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(*The form of the premise lets the induction bind xs and ys.*) |
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Goal "xs <~~> ys ==> xs=[] --> ys=[]"; |
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by (etac perm.induct 1); |
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by (ALLGOALS Asm_simp_tac); |
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qed "perm_Nil_lemma"; |
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(*A more general version is actually easier to understand!*) |
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Goal "xs <~~> ys ==> length(xs) = length(ys)"; |
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by (etac perm.induct 1); |
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by (ALLGOALS Asm_simp_tac); |
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qed "perm_length"; |
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Goal "xs <~~> ys ==> ys <~~> xs"; |
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by (etac perm.induct 1); |
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by (REPEAT (ares_tac perm.intrs 1)); |
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qed "perm_sym"; |
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Goal "[| xs <~~> ys |] ==> x mem xs --> x mem ys"; |
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by (etac perm.induct 1); |
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by (Fast_tac 4); |
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by (ALLGOALS Asm_simp_tac); |
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val perm_mem_lemma = result(); |
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bind_thm ("perm_mem", perm_mem_lemma RS mp); |
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(** Ways of making new permutations **) |
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(*We can insert the head anywhere in the list*) |
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Goal "a # xs @ ys <~~> xs @ a # ys"; |
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by (induct_tac "xs" 1); |
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by (simp_tac (simpset() addsimps [perm_refl]) 1); |
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by (Simp_tac 1); |
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by (etac ([perm.swap, perm.Cons] MRS perm.trans) 1); |
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qed "perm_append_Cons"; |
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(*single steps |
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by (rtac perm.trans 1); |
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by (rtac perm.swap 1); |
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by (rtac perm.Cons 1); |
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*) |
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Goal "xs@ys <~~> ys@xs"; |
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by (induct_tac "xs" 1); |
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by (simp_tac (simpset() addsimps [perm_refl]) 1); |
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by (Simp_tac 1); |
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by (etac ([perm.Cons, perm_append_Cons] MRS perm.trans) 1); |
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qed "perm_append_swap"; |
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Goal "a # xs <~~> xs @ [a]"; |
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by (rtac perm.trans 1); |
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by (rtac perm_append_swap 2); |
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by (simp_tac (simpset() addsimps [perm_refl]) 1); |
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qed "perm_append_single"; |
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Goal "rev xs <~~> xs"; |
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by (induct_tac "xs" 1); |
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by (simp_tac (simpset() addsimps [perm_refl]) 1); |
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by (Simp_tac 1); |
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by (rtac (perm_append_single RS perm_sym RS perm.trans) 1); |
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by (etac perm.Cons 1); |
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qed "perm_rev"; |
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Goal "xs <~~> ys ==> l@xs <~~> l@ys"; |
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by (induct_tac "l" 1); |
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by (Simp_tac 1); |
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by (asm_simp_tac (simpset() addsimps [perm.Cons]) 1); |
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qed "perm_append1"; |
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Goal "xs <~~> ys ==> xs@l <~~> ys@l"; |
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by (rtac (perm_append_swap RS perm.trans) 1); |
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by (etac (perm_append1 RS perm.trans) 1); |
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by (rtac perm_append_swap 1); |
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qed "perm_append2"; |
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