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src/HOL/Algebra/abstract/NatSum.thy
author wenzelm
Fri, 08 Mar 2002 16:24:06 +0100
changeset 13049 ce180e5b7fa0
parent 11093 62c2e0af1d30
permissions -rw-r--r--
tuned;

(*
    Sums with naturals as index domain
    $Id$
    Author: Clemens Ballarin, started 12 December 1996
*)

NatSum = Ring +

instance
  ring < plus_ac0 (a_assoc, a_comm, l_zero)

end
isabelle