A short and elementary proof of Hanner's theorem
General Topology
2010-11-19 v1 Geometric Topology
Abstract
Hanner's theorem is a classical theorem in the theory of retracts and extensors in topological spaces, which states that a local ANE is an ANE. While Hanner's original proof of the theorem is quite simple for separable spaces, it is rather involved for the general case. We provide a proof which is not only short, but also elementary, relying only on well-known classical point-set topology.
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Cite
@article{arxiv.1011.4145,
title = {A short and elementary proof of Hanner's theorem},
author = {Aasa Feragen},
journal= {arXiv preprint arXiv:1011.4145},
year = {2010}
}
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2 pages