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arXiv 0912.0198math.GR
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有限秩对称逆拓扑半群$\leqslant n$

Symmetric inverse topological semigroups of finite rank $\leqslant n$

Oleg Gutik, Andriy Reiter

摘要:

研究了秩为$\leqslant n$的有限变换对称逆拓扑半群$\mathscr{I}_λ^n$的拓扑性质.证明了拓扑逆半群$\mathscr{I}_λ^n$在拓扑逆半群类中是代数$h$ -闭的.证明了具有可数紧平方$S\times S$的拓扑半群$S$不包含无限基数$λ$的半群$\mathscr{I}_λ^n$,并证明了秩为$\leqslant n$的有限变换的无限拓扑对称逆半群$\mathscr{I}_λ^n$的Bohr紧化是平凡半群.

英文摘要:

We study topological properties of the symmetric inverse topological semigroup of finite transformations $\mathscr{I}_λ^n$ of the rank $\leqslant n$. We show that the topological inverse semigroup $\mathscr{I}_λ^n$ is algebraically $h$-closed in the class of topological inverse semigroups. Also we prove that a topological semigroup $S$ with countably compact square $S\times S$ does not contain the semigroup $\mathscr{I}_λ^n$ for infinite cardinal $λ$ and show that the Bohr compactification of an infinite topological symmetric inverse semigroup of finite transformations $\mathscr{I}_λ^n$ of the rank $\leqslant n$ is the trivial semigroup.

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