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- W4312082890 abstract "We first prove a version of Tietze-Urysohn's theorem for proper functions taking values in non-negative real numbers defined on $sigma$-compact locally compact Hausdorff spaces. As its application, we prove an extension theorem of proper metrics, which states that if $X$ is a $sigma$-compact locally compact space, $A$ is a closed subset of $X$, and $d$ is a proper metric on $A$ that generates the same topology of $A$, then there exists a proper metric on $X$ such that $D$ generates the same topology of $X$ and $D|_{A^{2}}=d$. Moreover, if $A$ is a proper retraction, we can choose $D$ so that $(A, d)$ is quasi-isometric to $(X, D)$. We also show analogues of theorems explained above for ultrametric spaces." @default.
- W4312082890 created "2023-01-04" @default.
- W4312082890 creator A5072870097 @default.
- W4312082890 date "2023-02-01" @default.
- W4312082890 modified "2023-09-27" @default.
- W4312082890 title "Extending proper metrics" @default.
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- W4312082890 doi "https://doi.org/10.1016/j.topol.2022.108387" @default.
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