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src/HOL/Algebra/abstract/NatSum.thy
author wenzelm
Fri, 08 Mar 2002 16:24:06 +0100
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3d0c34795831 Algebra and Polynomial theories, by Clemens Ballarin
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(*
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    Sums with naturals as index domain
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    $Id$
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    Author: Clemens Ballarin, started 12 December 1996
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*)
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NatSum = Ring +













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instance













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  ring < plus_ac0 (a_assoc, a_comm, l_zero)








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