Parametric Bing and Krasinkiewicz maps: revisited

Details Parametric Bing and Krasinkiewicz maps: revisited Parametric Bing and Krasinkiewicz maps: revisited

2008-12-15

arxiv.org/abs/0812.2899v3

Mathematics

General Topology

12 pages

Scientific paper

Let $M$ be a complete metric $ANR$-space such that for any metric compactum $K$ the function space $C(K,M)$ contains a dense set of Bing (resp., Krasinkiewicz) maps. It is shown that $M$ has the following property: If $f\colon X\to Y$ is a perfect surjection between metric spaces, then $C(X,M)$ with the source limitation topology contains a dense $G_\delta$-subset of maps $g$ such that all restrictions $g|f^{-1}(y)$, $y\in Y$, are Bing (resp., Krasinkiewicz) maps. We apply the above result to establish some mapping theorems for extensional dimension.

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