Abelian ring

Abelian ring

[ə′bēl·yən ′riŋ]
(mathematics)
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Note that M is an abelian module if and only if S is an abelian ring.
However they require [SIGMA] to be an abelian ring and the CA to be a ring homomorphism, which is again essentially the case d = 1.
1]]), where R is a finite abelian ring of characteristic 2.