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Extending homeomorphisms on Cantor cubes
E. Shchepina, V. Valovb a Steklov Mathematical Institute of Russian Academy of Sciences, 8 Gubkina St. Moscow, 119991, Russia
b Department of Computer Science and Mathematics, Nipissing University, 100 College Drive, P.O. Box 5002, North Bay, ON, P1B 8L7, Canada
Abstract:
We discuss the question of extending homeomorphism between closed subsets of the Cantor discontinuum $D^\tau$. For every set $P\subset D^\tau$ let $L_p$ be the set of cardinality $\lambda$ such that the $\lambda$-interior of $P$ is not empty. It is established that any homeomorphism $f$ between two proper closed subsets $P$ and $K$ of $D^\tau$ can be extended to an autohomeomorphism of $D^\tau$ provided the sets $L_p$ and $L_k$ do not have so many points of discontinuity and $f$ preserves the $\lambda$-interiors of $P$ and $K$.
Received: 22.09.2021 Revised: 13.01.2023 Accepted: 04.04.2023
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