src/HOL/Vimage.thy
author paulson
Wed, 08 Sep 1999 15:38:54 +0200
changeset 7515 0c05469cad57
parent 4648 f04da668581c
child 10065 ddb3a014f721
permissions -rw-r--r--
comments

(*  Title:      HOL/Vimage
    ID:         $Id$
    Author:     Lawrence C Paulson, Cambridge University Computer Laboratory
    Copyright   1998  University of Cambridge

Inverse image of a function
*)

Vimage = Set +

consts
  "-``"          :: ['a => 'b, 'b set] => ('a set)   (infixr 90)

defs
  vimage_def     "f-``B           == {x. f(x) : B}"

end