src/HOL/Vimage.thy
author paulson
Tue Feb 24 11:35:33 1998 +0100 (1998-02-24)
changeset 4648 f04da668581c
child 7515 0c05469cad57
permissions -rw-r--r--
New theory of the inverse image of a function
     1 Vimage = Set +
     2 
     3 consts
     4   "-``"          :: ['a => 'b, 'b set] => ('a set)   (infixr 90)
     5 
     6 defs
     7   vimage_def     "f-``B           == {x. f(x) : B}"
     8 
     9 end