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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 = case concl_of th of 
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_ $ (Const("op =",_)$_$_) => th RS @{thm eq_reflection} 
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 _ $ (Const("op <>",_)$_$_) => th RS @{thm iff_reflection} 
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 _ => 
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error("conclusion must be a =equality or <>");; 
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fun mk_eq th = case concl_of th of 

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Const("==",_)$_$_ => th 
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 _ $ (Const("op =",_)$_$_) => mk_meta_eq th 
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 _ $ (Const("op <>",_)$_$_) => mk_meta_eq th 

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 _ $ (Const("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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val mk_meta_prems = 
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rule_by_tactic 

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(REPEAT_FIRST (resolve_tac [@{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 rl = 
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Drule.export_without_context (mk_meta_eq (mk_meta_prems 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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[("op >", [@{thm mp}]), ("op &", [@{thm conjunct1}, @{thm conjunct2}]), 
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("All", [@{thm spec}]), ("True", []), ("False", [])]; 
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(* ###FIXME: move to simplifier.ML 
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val mk_atomize: (string * thm list) list > thm > thm list 
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*) 

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(* ###FIXME: move to simplifier.ML *) 
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fun mk_atomize pairs = 
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let fun atoms th = 

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(case concl_of th of 

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Const("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 = (map mk_eq o mk_atomize pairs o gen_all); 
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(** make simplification procedures for quantifier elimination **) 
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structure Quantifier1 = Quantifier1Fun( 
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struct 
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(*abstract syntax*) 
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fun dest_eq((c as Const("op =",_)) $ s $ t) = SOME(c,s,t) 
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 dest_eq _ = NONE; 

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fun dest_conj((c as Const("op &",_)) $ s $ t) = SOME(c,s,t) 

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 dest_conj _ = NONE; 

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fun dest_imp((c as Const("op >",_)) $ s $ t) = SOME(c,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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end); 
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val defEX_regroup = 
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Simplifier.simproc @{theory} 
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"defined EX" ["EX x. P(x)"] Quantifier1.rearrange_ex; 
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val defALL_regroup = 
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Simplifier.simproc @{theory} 
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"defined ALL" ["ALL x. P(x)"] Quantifier1.rearrange_all; 
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(*** Case splitting ***) 
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structure Splitter = Splitter 
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( 
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val thy = @{theory} 
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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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); 
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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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val op addsplits = Splitter.addsplits; 
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val op delsplits = Splitter.delsplits; 
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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 prems = FIRST'[resolve_tac (triv_rls @ prems), 
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atac, etac @{thm FalseE}]; 
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(*No premature instantiation of variables during simplification*) 
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fun safe_solver prems = FIRST'[match_tac (triv_rls @ prems), 
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eq_assume_tac, ematch_tac [@{thm FalseE}]]; 
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(*No simprules, but basic infastructure for simplification*) 
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val FOL_basic_ss = 
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Simplifier.theory_context @{theory} empty_ss 
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setsubgoaler asm_simp_tac 
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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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setmksimps (mksimps mksimps_pairs) 

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setmkcong mk_meta_cong; 

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fun unfold_tac ths = 
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let val ss0 = Simplifier.clear_ss FOL_basic_ss addsimps ths 

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in fn ss => ALLGOALS (full_simp_tac (Simplifier.inherit_context ss ss0)) end; 

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(*intuitionistic simprules only*) 
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val IFOL_ss = 
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FOL_basic_ss 

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addsimps (@{thms meta_simps} @ @{thms IFOL_simps} @ @{thms int_ex_simps} @ @{thms int_all_simps}) 
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addsimprocs [defALL_regroup, defEX_regroup] 
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addcongs [@{thm imp_cong}]; 
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(*classical simprules too*) 
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val FOL_ss = IFOL_ss addsimps (@{thms cla_simps} @ @{thms cla_ex_simps} @ @{thms cla_all_simps}); 
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val simpsetup = Simplifier.map_simpset (K FOL_ss); 
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(*** integration of simplifier with classical reasoner ***) 
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structure Clasimp = ClasimpFun 
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(structure Simplifier = Simplifier and Splitter = Splitter 
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and Classical = Cla and Blast = Blast 
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val iffD1 = @{thm iffD1} val iffD2 = @{thm iffD2} val notE = @{thm notE}); 
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open Clasimp; 
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ML_Antiquote.value "clasimpset" 
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(Scan.succeed "Clasimp.clasimpset_of (ML_Context.the_local_context ())"); 
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val FOL_css = (FOL_cs, FOL_ss); 