Clifford拓扑半群的度量化
Metrizability of Clifford topological semigroups
摘要:
证明了拓扑Clifford半群$S$是可度量化的当且仅当$S$是$M$ -空间,且$S$的幂等元集$E=\{e\in S:ee=e\}$是$S$中的可度量化$G_δ$ -集.同样的度量化准则也适用于任何可数紧Clifford拓扑半群$S$。
英文摘要:
We prove that a topological Clifford semigroup $S$ is metrizable if and only if $S$ is an $M$-space and the set $E=\{e\in S:ee=e\}$ of idempotents of $S$ is a metrizable $G_δ$-set in $S$. The same metrization criterion holds also for any countably compact Clifford topological semigroup $S$.
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