半群是左群的拟膨胀的等价刻画

The equivalent character that a semigroup is a quasi-inflation of a left group

利用半群S上的等价关系,给出了半群是左零带的拟膨胀及半群是左群的拟膨胀的充要条件,同时讨论了左零带及左群的膨胀。

A necessary and sufficient condition for both a semigroup S to be a quasi-inflation of a left group and a left zero band is gived. The inflation of a left zero band and a left group are investigated.