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Mat. Zametki, 2025 Volume 117, Issue 2, Pages 196–203 (Mi mzm14345)

Determinability of topological spaces by the semigroup of continuous binary relations

E.M. Vechtomova, M. V. Volkovb

a Vyatka State University, Kirov
b Ural Federal University named after the First President of Russia B. N. Yeltsin, Ekaterinburg

Abstract: We consider determinability of a topological space $X$ by a new derived algebraic object, the semigroup $CR(X)$ of all continuous binary relations on $X$ with the operation of composition of binary relations, and obtain results on the determinability of a $T_1$-space by the semigroup $CR(X)$ and of an arbitrary topological space $X$ by an algebraic system related to $CR(X)$. We prove that any finite topological space $X$ is absolutely determined by its semigroup $CR(X)$.

Keywords: topological space, $T_0$-space, semigroup of continuous binary relations, determinability, absolute determinability.

UDC: 512.556

MSC: 06F05, 54C50, 20M20

Received: 18.04.2024
Revised: 05.07.2024

DOI: 10.4213/mzm14345


 English version:
Mathematical Notes, 2025, 117:2, 208–213

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© Steklov Math. Inst. of RAS, 2025