著者 |
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.
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掲載誌情報 |
島根大学理学部紀要
26
, 39
- 42
, 1992-12-25
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出版者 | 島根大学理学部
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