author | wenzelm |
Mon, 20 Oct 1997 12:47:02 +0200 | |
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parent 248 | 0d0a6a17a02f |
permissions | -rw-r--r-- |
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(* Title: HOLCF/lift1.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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Lifting |
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*) |
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Lift1 = Cfun3 + |
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(* new type for lifting *) |
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types "u" 1 |
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arities "u" :: (pcpo)term |
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consts |
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Rep_Lift :: "('a)u => (void + 'a)" |
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Abs_Lift :: "(void + 'a) => ('a)u" |
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Iup :: "'a => ('a)u" |
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UU_lift :: "('a)u" |
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Ilift :: "('a->'b)=>('a)u => 'b" |
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less_lift :: "('a)u => ('a)u => bool" |
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rules |
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(*faking a type definition... *) |
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(* ('a)u is isomorphic to void + 'a *) |
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Rep_Lift_inverse "Abs_Lift(Rep_Lift(p)) = p" |
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Abs_Lift_inverse "Rep_Lift(Abs_Lift(p)) = p" |
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(*defining the abstract constants*) |
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UU_lift_def "UU_lift == Abs_Lift(Inl(UU))" |
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Iup_def "Iup(x) == Abs_Lift(Inr(x))" |
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Ilift_def "Ilift(f)(x)==\ |
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\ sum_case (Rep_Lift(x)) (%y.UU) (%z.f[z])" |
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less_lift_def "less_lift(x1)(x2) == \ |
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\ (sum_case (Rep_Lift(x1))\ |
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\ (% y1.True)\ |
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\ (% y2.sum_case (Rep_Lift(x2))\ |
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\ (% z1.False)\ |
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\ (% z2.y2<<z2)))" |
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end |
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