研究了拟交换链半群的结构和性质。
Structures and properties of quasi-commutative chained semigroups are studied.
作者证明了右完全半群的结构分解唯一性定理。
The authors also proved the uniqueness theorem on structure decomposition of right complete semigroups.
逆半群和具有逆断面的基础纯正半群的结构是比较简单的。
The constructions of inverse semigroups and fundamental orthodox semigroups with inverse transversals are simple.
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