author  berghofe 
Tue, 30 May 2000 18:02:49 +0200  
changeset 9001  93af64f54bf2 
parent 7515  0c05469cad57 
child 10065  ddb3a014f721 
permissions  rwrr 
7515  1 
(* 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 