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(* Title: HOLCF/Dnat2.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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Additional constants for dnat
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*)
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Dnat2 = Dnat +
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consts
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iterator :: "dnat -> ('a -> 'a) -> 'a -> 'a"
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defs
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iterator_def "iterator == fix`(LAM h n f x.
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dnat_when `x `(LAM m.f`(h`m`f`x)) `n)"
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end
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(*
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iterator`UU`f`x = UU
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iterator`dzero`f`x = x
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n~=UU --> iterator`(dsucc`n)`f`x = f`(iterator`n`f`x)
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*)
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