也是群的子半群叫做子群。

A subsemigroup which is also a group is called a subgroup.

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这些子半群在构造具有逆断面的正则半群中起决定性作用。

These subsemigroups play a decisive role in constructing regular semigroups with an inverse transversal.

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本研究每元生成的子半群成群的半群，得出这种半群的某些结构定理。

This paper discusses the semigroups, each of whose sub-semigroups generated by single element is a group and some structural theorems of these semigroups are derived.

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