author  wenzelm 
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permissions  rwrr 
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(* Title: FOL/simpdata.ML 
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Author: Lawrence C Paulson, Cambridge University Computer Laboratory 
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Copyright 1994 University of Cambridge 
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Simplification data for FOL. 
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*) 
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(*Make metaequalities. The operator below is Trueprop*) 
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fun mk_meta_eq th = 
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(case Thm.concl_of th of 

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_ $ (Const(@{const_name eq},_)$_$_) => th RS @{thm eq_reflection} 
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 _ $ (Const(@{const_name iff},_)$_$_) => th RS @{thm iff_reflection} 

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 _ => error "conclusion must be a =equality or <>"); 
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fun mk_eq th = 
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(case Thm.concl_of th of 

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Const(@{const_name Pure.eq},_)$_$_ => th 
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 _ $ (Const(@{const_name eq},_)$_$_) => mk_meta_eq th 
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 _ $ (Const(@{const_name iff},_)$_$_) => mk_meta_eq th 

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 _ $ (Const(@{const_name Not},_)$_) => th RS @{thm iff_reflection_F} 
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 _ => th RS @{thm iff_reflection_T}); 
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(*Replace premises x=y, X<>Y by X==Y*) 
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fun mk_meta_prems ctxt = 
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rule_by_tactic ctxt 

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(REPEAT_FIRST (resolve_tac ctxt [@{thm meta_eq_to_obj_eq}, @{thm def_imp_iff}])); 
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(*Congruence rules for = or <> (instead of ==)*) 
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fun mk_meta_cong ctxt rl = 
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Drule.zero_var_indexes (mk_meta_eq (mk_meta_prems ctxt rl)) 
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handle THM _ => 
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error("Premises and conclusion of congruence rules must use =equality or <>"); 
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val mksimps_pairs = 
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[(@{const_name imp}, [@{thm mp}]), (@{const_name conj}, [@{thm conjunct1}, @{thm conjunct2}]), 
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(@{const_name All}, [@{thm spec}]), (@{const_name True}, []), (@{const_name False}, [])]; 
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fun mk_atomize pairs = 

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let 
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fun atoms th = 

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(case Thm.concl_of th of 

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Const(@{const_name Trueprop},_) $ p => 

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(case head_of p of 

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Const(a,_) => 

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(case AList.lookup (op =) pairs a of 

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SOME(rls) => maps atoms ([th] RL rls) 

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 NONE => [th]) 

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 _ => [th]) 

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 _ => [th]) 

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in atoms end; 
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fun mksimps pairs ctxt = map mk_eq o mk_atomize pairs o Variable.gen_all ctxt; 
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(** make simplification procedures for quantifier elimination **) 
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structure Quantifier1 = Quantifier1 
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( 

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(*abstract syntax*) 
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fun dest_eq (Const (@{const_name eq}, _) $ s $ t) = SOME (s, t) 
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 dest_eq _ = NONE 

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fun dest_conj (Const (@{const_name conj}, _) $ s $ t) = SOME (s, t) 

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 dest_conj _ = NONE 

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fun dest_imp (Const (@{const_name imp}, _) $ s $ t) = SOME (s, t) 

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 dest_imp _ = NONE 

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val conj = FOLogic.conj 
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val imp = FOLogic.imp 
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(*rules*) 
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val iff_reflection = @{thm iff_reflection} 
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val iffI = @{thm iffI} 
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val iff_trans = @{thm iff_trans} 
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val conjI= @{thm conjI} 
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val conjE= @{thm conjE} 
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val impI = @{thm impI} 
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val mp = @{thm mp} 
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val uncurry = @{thm uncurry} 
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val exI = @{thm exI} 
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val exE = @{thm exE} 
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val iff_allI = @{thm iff_allI} 
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val iff_exI = @{thm iff_exI} 
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val all_comm = @{thm all_comm} 
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val ex_comm = @{thm ex_comm} 
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); 
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(*** Case splitting ***) 
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structure Splitter = Splitter 
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( 
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val context = @{context} 
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val mk_eq = mk_eq 
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val meta_eq_to_iff = @{thm meta_eq_to_iff} 
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val iffD = @{thm iffD2} 
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val disjE = @{thm disjE} 
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val conjE = @{thm conjE} 
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val exE = @{thm exE} 
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val contrapos = @{thm contrapos} 
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val contrapos2 = @{thm contrapos2} 
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val notnotD = @{thm notnotD} 
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val safe_tac = Cla.safe_tac 
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); 
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val split_tac = Splitter.split_tac; 
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val split_inside_tac = Splitter.split_inside_tac; 
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val split_asm_tac = Splitter.split_asm_tac; 
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(*** Standard simpsets ***) 
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val triv_rls = [@{thm TrueI}, @{thm refl}, reflexive_thm, @{thm iff_refl}, @{thm notFalseI}]; 
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fun unsafe_solver ctxt = 
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FIRST' [resolve_tac ctxt (triv_rls @ Simplifier.prems_of ctxt), 
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assume_tac ctxt, 
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eresolve_tac ctxt @{thms FalseE}]; 
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(*No premature instantiation of variables during simplification*) 
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fun safe_solver ctxt = 
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FIRST' [match_tac ctxt (triv_rls @ Simplifier.prems_of ctxt), 
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eq_assume_tac, ematch_tac ctxt @{thms FalseE}]; 

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(*No simprules, but basic infastructure for simplification*) 
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val FOL_basic_ss = 
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empty_simpset @{context} 
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setSSolver (mk_solver "FOL safe" safe_solver) 
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setSolver (mk_solver "FOL unsafe" unsafe_solver) 

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> Simplifier.set_subgoaler asm_simp_tac 
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> Simplifier.set_mksimps (mksimps mksimps_pairs) 
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> Simplifier.set_mkcong mk_meta_cong 
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> simpset_of; 
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fun unfold_tac ctxt ths = 
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ALLGOALS (full_simp_tac (clear_simpset (put_simpset FOL_basic_ss ctxt) addsimps ths)); 
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(*** integration of simplifier with classical reasoner ***) 
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structure Clasimp = Clasimp 
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( 

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structure Simplifier = Simplifier 

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and Splitter = Splitter 

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and Classical = Cla 

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and Blast = Blast 

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val iffD1 = @{thm iffD1} 

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val iffD2 = @{thm iffD2} 

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val notE = @{thm notE} 

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open Clasimp; 
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149 