Representing fine shape of local compacta by homotopy classes of ordinary maps
Abstract
Fine shape, as defined by Melikhov, is an extension of the strong shape category of compacta (compact metrizable topological spaces) to all metrizable spaces, notable for being compatible with both \v{C}ech cohomology and Steenrod-Sitnikov homology. In this work we study fine shape of local compacta (locally compact separable metrizable spaces), and construct, for every local compactum , a space unique up to a homotopy equivalence and such that fine shape classes from any locally compact metrizable space to bijectively correspond to homotopy classes of ordinary maps from to . This correspondence is (contravariatly) functorial in , thus giving a representation of -dependent contravariant functor for a fixed ; the universal class corresponding to the identity map of is the homotopy class of a specific embedding of into that is a fine shape equivalence.
Cite
@article{arxiv.2510.12808,
title = {Representing fine shape of local compacta by homotopy classes of ordinary maps},
author = {Vladislav Zemlyanoy},
journal= {arXiv preprint arXiv:2510.12808},
year = {2025}
}
Comments
17 pages