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A homological selection theorem implying a division theorem for $Q$-manifolds

Tom 77 / 2007

Taras Banakh, Robert Cauty Banach Center Publications 77 (2007), 11-22 MSC: 54C65, 55N10, 55M20, 54H25, 57N20, 57N75. DOI: 10.4064/bc77-0-1

Streszczenie

We prove that a space $M$ with Disjoint Disk Property is a $Q$-manifold if and only if $M\times X$ is a $Q$-manifold for some $C$-space $X$. This implies that the product $M\times I^2$ of a space $M$ with the disk is a $Q$-manifold if and only if $M\times X$ is a $Q$-manifold for some $C$-space $X$. The proof of these theorems exploits the homological characterization of $Q$-manifolds due to Daverman and Walsh, combined with the existence of $G$-stable points in $C$-spaces. To establish the existence of such points we prove (and afterward apply) homological versions of the Brouwer Fixed Point Theorem and of Uspenskij's Selection Theorem.

Autorzy

  • Taras BanakhInstytut Matematyki
    Akademia Świętokrzyska
    Kielce, Poland
    and
    Department of Mathematics
    Ivan Franko Lviv National University
    Lviv, Ukraine
    and
    Nipissing University
    North Bay, Canada
    e-mail
  • Robert CautyUniversité Paris VI, France
    e-mail

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