src/HOL/Algebra/abstract/RingHomo.thy
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     1 (*
     1 (*  Author: Clemens Ballarin, started 15 April 1997
     2     Ring homomorphism
     2 
     3     $Id$
     3 Ring homomorphism.
     4     Author: Clemens Ballarin, started 15 April 1997
       
     5 *)
     4 *)
     6 
     5 
     7 header {* Ring homomorphism *}
     6 header {* Ring homomorphism *}
     8 
     7 
     9 theory RingHomo
     8 theory RingHomo