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(* Title: ZF/simpdata.ML

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Author: Lawrence C Paulson, Cambridge University Computer Laboratory


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Copyright 1991 University of Cambridge


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Rewriting for ZF set theory: specialized extraction of rewrites from theorems.

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*)


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(*** New version of mk_rew_rules ***)

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(*Should False yield False<>True, or should it solve goals some other way?*)


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(*Analyse a theorem to atomic rewrite rules*)

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fun atomize (conn_pairs, mem_pairs) th =

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let fun tryrules pairs t =

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case head_of t 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 (atomize (conn_pairs, mem_pairs)) ([th] RL rls)


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 NONE => [th])

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 _ => [th]

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in case concl_of th of

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

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(case P of

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Const(@{const_name mem},_) $ a $ b => tryrules mem_pairs b

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 Const(@{const_name True},_) => []


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 Const(@{const_name False},_) => []

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 A => tryrules conn_pairs A)

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 _ => [th]


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end;


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(*Analyse a rigid formula*)

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val ZF_conn_pairs =

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[(@{const_name Ball}, [@{thm bspec}]),


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(@{const_name All}, [@{thm spec}]),

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(@{const_name imp}, [@{thm mp}]),


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(@{const_name conj}, [@{thm conjunct1}, @{thm conjunct2}])];

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(*Analyse a:b, where b is rigid*)

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val ZF_mem_pairs =

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[(@{const_name Collect}, [@{thm CollectD1}, @{thm CollectD2}]),


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(@{const_name Diff}, [@{thm DiffD1}, @{thm DiffD2}]),


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(@{const_name Int}, [@{thm IntD1}, @{thm IntD2}])];

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val ZF_atomize = atomize (ZF_conn_pairs, ZF_mem_pairs);


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