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島根大学理学部紀要 Volume 26
published_at 1992-12-25
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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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.
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