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Transactions of the American Mathematical Society

ISSN 1088-6850(online) ISSN 0002-9947(print)

 
 

 

On embeddings with locally nice cross-sections


Author: J. L. Bryant
Journal: Trans. Amer. Math. Soc. 155 (1971), 327-332
MSC: Primary 57.05
DOI: https://doi.org/10.1090/S0002-9947-1971-0276983-6
MathSciNet review: 0276983
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Abstract: A $k$-dimensional compactum ${X^k}$ in euclidean space ${E^n}(n - k \geqq 3)$ is said to be locally nice in ${E^n}$ if ${E^n} - {X^k}$ is $1$-ULC. In this paper we prove a general theorem which implies, in particular, that ${X^k}$ is locally nice in ${E^n}$ if the intersection of ${X^k}$ with each horizontal hyperplane of ${E^n}$ is locally nice in the hyperplane. From known results we obtain immediately that a $k$-dimensional polyhedron $P$ in ${E^n}$ ($n - k \geqq 3$ and $n \geqq 5$) is tame in ${E^n}$ if each $({E^{n - 1}} \times \{ w\} ) - P(w \in {E^1})$ is $1$-ULC. However, by strengthening our general theorem in the case $n = 4$, we are able to prove this result for $n = 4$ as well. For example, an arc $A$ in ${E^4}$ is tame if each horizontal cross-section of $A$ is tame in the cross-sectional hyperplane (that is, lies in an arc that is tame in the hyperplane).


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Keywords: Locally nice embeddings, <IMG WIDTH="16" HEIGHT="20" ALIGN="BOTTOM" BORDER="0" SRC="images/img1.gif" ALT="$1$">-ULC subsets of <IMG WIDTH="33" HEIGHT="20" ALIGN="BOTTOM" BORDER="0" SRC="images/img2.gif" ALT="${E^n}$">, tame embeddings, embeddings with tame cross-sections, embeddings with locally nice cross-sections, topological embeddings of compacta, topological embeddings of polyhedra
Article copyright: © Copyright 1971 American Mathematical Society