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arXiv · 1602.06435

Nonstandard homology theory for uniform spaces

Takuma Imamura
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Abstract

We introduce a new homology theory of uniform spaces, provisionally called $μ$-homology theory. Our homology theory is based on hyperfinite chains of microsimplices. This idea is due to McCord. We prove that $μ$-homology theory satisfies the Eilenberg-Steenrod axioms. The characterization of chain-connectedness in terms of $μ$-homology is provided. We also introduce the notion of S-homotopy, which is weaker than uniform homotopy. We prove that $μ$-homology theory satisfies the S-homotopy axiom, and that every uniform space can be S-deformation retracted to a dense subset. It follows that for every uniform space $X$ and any dense subset $A$ of $X$, $X$ and $A$ have the same $μ$-homology. We briefly discuss the difference and similarity between $μ$-homology and McCord homology.

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Takuma Imamura. 2018-12-03. Nonstandard homology theory for uniform spaces. https://doi.org/10.1016/j.topol.2016.05.016

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