src/HOLCF/Tr1.thy
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Thu, 06 Oct 1994 18:40:18 +0100
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(*  Title: 	HOLCF/tr1.thy
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    ID:         $Id$
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    Author: 	Franz Regensburger
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    Copyright   1993 Technische Universitaet Muenchen
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Introduce the domain of truth values tr = one ++ one
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The type is axiomatized as the least solution of a domain equation.
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The functor term that specifies the domain equation is: 
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  FT = <++,K_{one},K_{one}>
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For details see chapter 5 of:
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[Franz Regensburger] HOLCF: Eine konservative Erweiterung von HOL um LCF,
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                     Dissertation, Technische Universit"at M"unchen, 1994
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*)
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Tr1 = One +
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types tr 0
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arities tr :: pcpo
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consts
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	abs_tr		:: "one ++ one -> tr"
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	rep_tr		:: "tr -> one ++ one"
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	TT 		:: "tr"
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	FF		:: "tr"
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	tr_when 	:: "'c -> 'c -> tr -> 'c"
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rules
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  abs_tr_iso	"abs_tr[rep_tr[u]] = u"
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  rep_tr_iso	"rep_tr[abs_tr[x]] = x"
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  TT_def	"TT == abs_tr[sinl[one]]"
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  FF_def	"FF == abs_tr[sinr[one]]"
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  tr_when_def "tr_when == (LAM e1 e2 t.when[LAM x.e1][LAM y.e2][rep_tr[t]])"
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end
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