src/ZF/ex/twos_compl.thy
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     1 (*  ID:         $Id$
       
     2     Author: 	Lawrence C Paulson, Cambridge University Computer Laboratory
       
     3     Copyright   1994  University of Cambridge
       
     4 *)
       
     5 
       
     6 (*Dummy theory; allows twos_compl itself to be a dependency *)
       
     7 
       
     8 twos_compl = Pure