島根大学理学部紀要

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島根大学理学部紀要 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
山田 深雪
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内容記述(抄録等)
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.