src/FOL/cladata.ML
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(*  Title:      FOL/cladata.ML
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    ID:         $Id$
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    Author:     Tobias Nipkow
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    Copyright   1996  University of Cambridge
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Setting up the classical reasoner.
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*)
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section "Classical Reasoner";
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(*** Applying ClassicalFun to create a classical prover ***)
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structure Classical_Data = 
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  struct
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  val mp        = mp
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  val not_elim  = notE
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  val classical = classical
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  val sizef     = size_of_thm
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  val hyp_subst_tacs=[hyp_subst_tac]
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  end;
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structure Cla = ClassicalFun(Classical_Data);
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structure BasicClassical: BASIC_CLASSICAL = Cla; open BasicClassical;
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(*Better for fast_tac: needs no quantifier duplication!*)
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qed_goal "alt_ex1E" IFOL.thy
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    "[| EX! x. P(x);                                              \
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\       !!x. [| P(x);  ALL y y'. P(y) & P(y') --> y=y' |] ==> R  \
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\    |] ==> R"
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 (fn major::prems =>
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  [ (rtac (major RS ex1E) 1),
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    (REPEAT (ares_tac (allI::prems) 1)),
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    (etac (dup_elim allE) 1),
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    (IntPr.fast_tac 1)]);
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(*Propositional rules*)
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val prop_cs = empty_cs addSIs [refl,TrueI,conjI,disjCI,impI,notI,iffI] 
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                       addSEs [conjE,disjE,impCE,FalseE,iffCE];
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(*Quantifier rules*)
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val FOL_cs = prop_cs addSIs [allI,ex_ex1I] addIs [exI] 
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                     addSEs [exE,alt_ex1E] addEs [allE];
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val cla_setup = (fn thy => (change_claset_of thy (fn _ => FOL_cs); thy));
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val case_setup =
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 (Method.add_methods
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    [("case_tac", Method.goal_args Args.name case_tac,
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      "case_tac emulation (dynamic instantiation!)")]);