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arXiv · 2601.02100

On topologization of subsemigroups of the bicyclic monoid

Adriana Chornenka·Oleg Gutik
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Abstract

We show that if a subsemigroup $S$ of the bicyclic monoid ${\mathscr{C}}(p,q)$ contains infinitely many idempotents then $S$ admits only the discrete Hausdorff shift-continuous topology. Also we proof that every right-continuous (left-continuous\emph) Hausdorff Baire topology on the semigroup $\mathscr{C}_+(a,b)$ $(\mathscr{C}_-(a,b))$ is discrete and the same statement holds for the bicyclic monoid.

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Adriana Chornenka, Oleg Gutik. 2026-01-05. On topologization of subsemigroups of the bicyclic monoid. https://arxiv.org/abs/2601.02100

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