src/HOL/Vimage.thy
author paulson
Wed, 08 Sep 1999 15:38:54 +0200
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(*  Title:      HOL/Vimage
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    ID:         $Id$
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    Author:     Lawrence C Paulson, Cambridge University Computer Laboratory
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    Copyright   1998  University of Cambridge
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Inverse image of a function
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*)
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Vimage = Set +
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consts
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  "-``"          :: ['a => 'b, 'b set] => ('a set)   (infixr 90)
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defs
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  vimage_def     "f-``B           == {x. f(x) : B}"
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end