Memoirs of the Faculty of Science, Shimane University

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Memoirs of the Faculty of Science, Shimane University 26
1992-12-25 発行

半群における外的可換性と可換性

External Commutativity and Commutativity in Semigroups
Yamada, Miyuki
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Description
A semigroup S is called externally commutative if S satisfies the permutation identity xyz zyx, In this paper the structure of externally commutative semigroups will be studied. It will be shown that an externally commutative semigroup IS a certain special ideal extension of a commutative semigroup by a null semigroup.