src/ZF/QUniv.thy
author paulson
Wed, 13 Jan 1999 11:57:09 +0100
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permissions -rw-r--r--
datatype package improvements
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(*  Title:      ZF/QUniv.thy
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    ID:         $Id$
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    Author:     Lawrence C Paulson, Cambridge University Computer Laboratory
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    Copyright   1993  University of Cambridge
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A small universe for lazy recursive types.
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*)
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QUniv = Univ + QPair + mono + equalities +
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(*Disjoint sums as a datatype*)
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rep_datatype 
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  elim		sumE
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  induct	TrueI
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  case_eqns	case_Inl, case_Inr
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(*Variant disjoint sums as a datatype*)
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rep_datatype 
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  elim		qsumE
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  induct	TrueI
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  case_eqns	qcase_QInl, qcase_QInr
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constdefs
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  quniv :: i => i
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   "quniv(A) == Pow(univ(eclose(A)))"
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end