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| Main Author: | |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2602.21313 |
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Table of Contents:
- The famous Michael selection theorem deals with the characterisation of paracompact spaces by continuous selections of lower semi-continuous mappings in Banach spaces. In this paper, we will discuss several equivalent forms of this theorem, without explicitly mentioning paracompactness. This will be based on a previous result, also obtained by Michael, that a space $X$ is paracompact if and only if every open cover of $X$ has an index-subordinated partition of unity. Thus, we will show that the existence of such partitions of unity on a space $X$ is equivalent to the existence of continuous selections for special lower semi-continuous mappings from $X$ to the nonempty convex subsets of special function spaces.