src/HOLCF/Ssum3.thy
author paulson
Thu, 18 Jan 1996 10:38:29 +0100
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(*  Title: 	HOLCF/ssum3.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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Class instance of  ++ for class pcpo
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*)
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Ssum3 = Ssum2 +
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arities "++" :: (pcpo,pcpo)pcpo			(* Witness ssum2.ML *)
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consts  
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	sinl	:: "'a -> ('a++'b)" 
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	sinr	:: "'b -> ('a++'b)" 
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	sswhen	:: "('a->'c)->('b->'c)->('a ++ 'b)-> 'c"
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rules 
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inst_ssum_pcpo	"(UU::'a++'b) = Isinl(UU)"
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defs
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sinl_def	"sinl   == (LAM x.Isinl(x))"
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sinr_def	"sinr   == (LAM x.Isinr(x))"
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sswhen_def	"sswhen   == (LAM f g s.Iwhen(f)(g)(s))"
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translations
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"case s of sinl`x => t1 | sinr`y => t2" == "sswhen`(LAM x.t1)`(LAM y.t2)`s"
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(* start 8bit 1 *)
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(* end 8bit 1 *)
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end