English

Krasinkiewicz spaces and parametric Krasinkiewicz maps

General Topology 2008-03-28 v2 Geometric Topology

Abstract

We say that a metrizable space MM is a Krasinkiewicz space if any map from a metrizable compactum XX into MM can be approximated by Krasinkiewicz maps (a map g ⁣:XMg\colon X\to M is Krasinkiewicz provided every continuum in XX is either contained in a fiber of gg or contains a component of a fiber of gg). In this paper we establish the following property of Krasinkiewicz spaces: Let f ⁣:XYf\colon X\to Y be a perfect map between metrizable spaces and MM a Krasinkiewicz complete ANRANR-space. If YY is a countable union of closed finite-dimensional subsets, then the function space C(X,M)C(X,M) with the source limitation topology contains a dense GδG_{\delta}-subset of maps gg such that all restrictions gf1(y)g|f^{-1}(y), yYy\in Y, are Krasinkiewicz maps. The same conclusion remains true if MM is homeomorphic to a closed convex subset of a Banach space and XX is a CC-space.

Keywords

Cite

@article{arxiv.0802.4436,
  title  = {Krasinkiewicz spaces and parametric Krasinkiewicz maps},
  author = {Eiichi Matsuhashi and Vesko Valov},
  journal= {arXiv preprint arXiv:0802.4436},
  year   = {2008}
}

Comments

14 pages

R2 v1 2026-06-21T10:17:15.383Z