关于有邻接紧凑理想的半群 $\boldsymbol{B}_{[0,\infty)}$ 上的局部紧凑移位连续拓扑学

Q3 Mathematics Matematychni Studii Pub Date : 2024-01-12 DOI:10.30970/ms.61.1.10-21
O. Gutik, Markian Khylynskyi
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The set $\\boldsymbol{B}_{[0,\\infty)}=[0,\\infty)\\times [0,\\infty)$ with the following binary operation $(a,b)(c,d)=(a+c-\\min\\{b,c\\},b+d-\\min\\{b,c\\})$ is a bisimple inverse semigroup.In the paper we study Hausdorff locally compact shift-continuous topologies on the semigroup $\\boldsymbol{B}_{[0,\\infty)}$ with an adjoined compact ideal of the following tree types.The semigroup $\\boldsymbol{B}_{[0,\\infty)}$ with the induced usual topology $\\tau_u$ from $\\mathbb{R}^2$, with the topology $\\tau_L$ which is generated by the natural partial order on the inverse semigroup $\\boldsymbol{B}_{[0,\\infty)}$, and the discrete topology are denoted by $\\boldsymbol{B}^1_{[0,\\infty)}$, $\\boldsymbol{B}^2_{[0,\\infty)}$, and $\\boldsymbol{B}^{\\mathfrak{d}}_{[0,\\infty)}$, respectively. We show that if $S_1^I$ ($S_2^I$) is a Hausdorff locally compact semitopological semigroup $\\boldsymbol{B}^1_{[0,\\infty)}$ ($\\boldsymbol{B}^2_{[0,\\infty)}$) with an adjoined compact ideal $I$ then either $I$ is an open subset of $S_1^I$ ($S_2^I$) or the topological space $S_1^I$ ($S_2^I$) is compact. 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引用次数: 0

摘要

让 $[0,\infty)$ 是所有非负实数的集合。集合 $boldsymbol{B}_{[0,\infty)}=[0,\infty)\times[0,\infty)$具有如下二元运算 $(a,b)(c,d)=(a+c-\min\{b,c\},b+d-\min\{b,c\})$ 是一个双简单逆半群。本文将研究具有以下树型的邻接紧凑理想的半群 $\boldsymbol{B}_{[0,\infty)}$ 上的 Hausdorff 局部紧凑移位连续拓扑。半群 $\boldsymbol{B}_{[0,\infty)}$ 具有来自 $\mathbb{R}^2$ 的诱导通常拓扑 $\tau_u$,拓扑 $\tau_L$是由逆半群 $\boldsymbol{B}_{[0、\和离散拓扑分别用 $\boldsymbol{B}^1_{[0,\infty)}$, $\boldsymbol{B}^2_{[0,\infty)}$ 和 $\boldsymbol{B}^{mathfrak{d}}_{[0,\infty)}$ 表示。我们证明,如果 $S_1^I$ ($S_2^I$) 是一个 Hausdorff 局部紧凑半拓扑半群 $\boldsymbol{B}^1_{[0,\infty)}$ ($\boldsymbol{B}^2_{[0、\infty)}$)有一个邻接的紧凑理想 $I$,那么要么 $I$ 是 $S_1^I$ ($S_2^I$) 的开放子集,要么拓扑空间 $S_1^I$ ($S_2^I$) 是紧凑的。作为推论,我们可以得到在 $S^1_{\boldsymbol{0}}=\boldsymbol{B}^1_{[0,\infty)}\cup\{\boldsymbol{0}\}$(res.$S^2_{\boldsymbol{0}}=\boldsymbol{B}^2_{[0,\infty)}/cup\{boldsymbol{0}/}$)有一个邻接零$\boldsymbol{0}$要么与拓扑空间$\boldsymbol{B}^1_{[0,\infty)}$的一点亚历山德罗夫压缩同构(res.或零是 $S^1_{\boldsymbol{0}}$ (即 $S^2_{\boldsymbol{0}}$)的孤立点。此外,我们还证明了如果 $S_{\mathfrak{d}}^I$ 是一个具有邻接紧凑理想 $I$ 的 Hausdorff 局部紧凑半拓扑半群 $\boldsymbol{B}^{mathfrak{d}}_{[0,\infty)}$,那么 $I$ 是 $S_{\mathfrak{d}}^I$ 的一个开放子集。
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On locally compact shift continuous topologies on the semigroup $\boldsymbol{B}_{[0,\infty)}$ with an adjoined compact ideal
Let $[0,\infty)$ be the set of all non-negative real numbers. The set $\boldsymbol{B}_{[0,\infty)}=[0,\infty)\times [0,\infty)$ with the following binary operation $(a,b)(c,d)=(a+c-\min\{b,c\},b+d-\min\{b,c\})$ is a bisimple inverse semigroup.In the paper we study Hausdorff locally compact shift-continuous topologies on the semigroup $\boldsymbol{B}_{[0,\infty)}$ with an adjoined compact ideal of the following tree types.The semigroup $\boldsymbol{B}_{[0,\infty)}$ with the induced usual topology $\tau_u$ from $\mathbb{R}^2$, with the topology $\tau_L$ which is generated by the natural partial order on the inverse semigroup $\boldsymbol{B}_{[0,\infty)}$, and the discrete topology are denoted by $\boldsymbol{B}^1_{[0,\infty)}$, $\boldsymbol{B}^2_{[0,\infty)}$, and $\boldsymbol{B}^{\mathfrak{d}}_{[0,\infty)}$, respectively. We show that if $S_1^I$ ($S_2^I$) is a Hausdorff locally compact semitopological semigroup $\boldsymbol{B}^1_{[0,\infty)}$ ($\boldsymbol{B}^2_{[0,\infty)}$) with an adjoined compact ideal $I$ then either $I$ is an open subset of $S_1^I$ ($S_2^I$) or the topological space $S_1^I$ ($S_2^I$) is compact. As a corollary we obtain that the topological space of a Hausdorff locally compact shift-continuous topology on $S^1_{\boldsymbol{0}}=\boldsymbol{B}^1_{[0,\infty)}\cup\{\boldsymbol{0}\}$ (resp. $S^2_{\boldsymbol{0}}=\boldsymbol{B}^2_{[0,\infty)}\cup\{\boldsymbol{0}\}$) with an adjoined zero $\boldsymbol{0}$ is either homeomorphic to the one-point Alexandroff compactification of the topological space $\boldsymbol{B}^1_{[0,\infty)}$ (resp. $\boldsymbol{B}^2_{[0,\infty)}$) or zero is an isolated point of $S^1_{\boldsymbol{0}}$ (resp. $S^2_{\boldsymbol{0}}$).Also, we proved that if $S_{\mathfrak{d}}^I$ is a Hausdorff locally compact semitopological semigroup $\boldsymbol{B}^{\mathfrak{d}}_{[0,\infty)}$ with an adjoined compact ideal $I$ then $I$ is an open subset of $S_{\mathfrak{d}}^I$.
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Matematychni Studii
Matematychni Studii Mathematics-Mathematics (all)
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1.00
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期刊介绍: Journal is devoted to research in all fields of mathematics.
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