author | paulson |
Tue, 07 May 1996 18:19:13 +0200 | |
changeset 1730 | 1c7f793fc374 |
parent 1486 | 7b95d7b49f7a |
child 1974 | b50f96543dec |
permissions | -rw-r--r-- |
1288 | 1 |
(* Title: HOL/Lambda/ParRed.ML |
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ID: $Id$ |
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Author: Tobias Nipkow |
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Copyright 1995 TU Muenchen |
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Properties of => and cd, in particular the diamond property of => and |
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confluence of beta. |
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*) |
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open ParRed; |
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Addsimps par_beta.intrs; |
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val par_beta_cases = map (par_beta.mk_cases db.simps) |
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["Var n => t", "Fun s => Fun t", |
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"(Fun s) @ t => u", "s @ t => u", "Fun s => t"]; |
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val parred_cs = lambda_cs addSIs par_beta.intrs addSEs par_beta_cases; |
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(*** beta <= par_beta <= beta^* ***) |
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goal ParRed.thy "(Var n => t) = (t = Var n)"; |
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by(fast_tac parred_cs 1); |
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qed "par_beta_varL"; |
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Addsimps [par_beta_varL]; |
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goal ParRed.thy "t => t"; |
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by(db.induct_tac "t" 1); |
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by(ALLGOALS Asm_simp_tac); |
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qed"par_beta_refl"; |
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Addsimps [par_beta_refl]; |
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goal ParRed.thy "beta <= par_beta"; |
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by (rtac subsetI 1); |
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by (split_all_tac 1); |
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by (etac beta.induct 1); |
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by (ALLGOALS(fast_tac (parred_cs addSIs [par_beta_refl]))); |
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qed "beta_subset_par_beta"; |
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goal ParRed.thy "par_beta <= beta^*"; |
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by (rtac subsetI 1); |
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by (split_all_tac 1); |
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by (etac par_beta.induct 1); |
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by (ALLGOALS |
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(fast_tac (parred_cs addIs |
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[rtrancl_beta_Fun,rtrancl_beta_App,rtrancl_refl, |
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rtrancl_into_rtrancl] |
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addEs [rtrancl_trans]))); |
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qed "par_beta_subset_beta"; |
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(*** => ***) |
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goal ParRed.thy "!t' n. t => t' --> lift t n => lift t' n"; |
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by(db.induct_tac "t" 1); |
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by(ALLGOALS(fast_tac (parred_cs addss (!simpset)))); |
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qed_spec_mp "par_beta_lift"; |
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Addsimps [par_beta_lift]; |
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goal ParRed.thy |
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1124
a6233ea105a4
Polished the presentation making it completely definitional.
nipkow
parents:
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diff
changeset
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"!s s' t' n. s => s' --> t => t' --> t[s/n] => t'[s'/n]"; |
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by(db.induct_tac "t" 1); |
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by(asm_simp_tac (addsplit(!simpset)) 1); |
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by(strip_tac 1); |
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bes par_beta_cases 1; |
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by(Asm_simp_tac 1); |
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by(asm_simp_tac (!simpset addsimps [subst_subst RS sym]) 1); |
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by(fast_tac (parred_cs addSIs [par_beta_lift] addss (!simpset)) 1); |
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by(fast_tac (parred_cs addss (!simpset)) 1); |
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qed_spec_mp "par_beta_subst"; |
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(*** Confluence (directly) ***) |
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goalw ParRed.thy [diamond_def,commute_def,square_def] "diamond(par_beta)"; |
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by (rtac (impI RS allI RS allI) 1); |
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by (etac par_beta.induct 1); |
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by(ALLGOALS(fast_tac (parred_cs addSIs [par_beta_subst]))); |
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qed "diamond_par_beta"; |
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(*** cd ***) |
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goal ParRed.thy "!t. s => t --> t => cd s"; |
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by(db.induct_tac "s" 1); |
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by(Simp_tac 1); |
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be rev_mp 1; |
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by(db.induct_tac "db1" 1); |
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by(ALLGOALS(fast_tac (parred_cs addSIs [par_beta_subst] addss (!simpset)))); |
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qed_spec_mp "par_beta_cd"; |
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(*** Confluence (via cd) ***) |
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goalw ParRed.thy [diamond_def,commute_def,square_def] "diamond(par_beta)"; |
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by(fast_tac (HOL_cs addIs [par_beta_cd]) 1); |
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qed "diamond_par_beta2"; |
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goal ParRed.thy "confluent(beta)"; |
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by(fast_tac (HOL_cs addIs [diamond_par_beta2,diamond_to_confluence, |
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par_beta_subset_beta,beta_subset_par_beta]) 1); |
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qed"beta_confluent"; |