T.Banakh

  1. On topological groups (locally) homeomorphic to LF-spaces.

    Authors: T.Banakh, K.Mine, D.Repovs, K.Sakai, T.Yagasaki
    Subjects: Group Theory
    Abstract

    We study topological structure of the direct limit $glim G_n$ of an
    increasing sequence of Polish ANR-groups $(G_n)_n$ in the category of
    topological groups and find conditions under which the group $glim G_n$ is
    (locally) homeomorphic to one of the following LF-spaces: $\IR^m$,
    $\IR^\infty$, $l_2$ or $l_2\times\IR^\infty$.

  2. Characterizing meager paratopological groups.

    Authors: T.Banakh, I.Guran, A.Ravsky
    Subjects: General Topology
    Abstract

    We prove that a Hausdorff paratopological group G is meager if and only if
    there are a nowhere dense subset A of G and a countable subset C in G such that
    CA=G=AC.

  3. The topology of systems of hyperspaces determined by dimension functions.

    Authors: T.Banakh, N.Mazurenko
    Subjects: General Topology
    Abstract

    Given a non-degenerate Peano continuum $X$, a dimension function
    $D:2^X_*\to[0,\infty]$ defined on the family $2^X_*$ of compact subsets of $X$,
    and a subset $\Gamma\subset[0,\infty)$, we recognize the topological structure
    of the system $(2^X,\D_{\le\gamma}(X))_{\alpha\in\Gamma}$, where $2^X$ is the
    hyperspace of non-empty compact subsets of $X$ and $D_{\le\gamma}(X)$ is the
    subspace of $2^X$, consisting of non-empty compact subsets $K\subset X$ with
    $D(K)\le\gamma$.

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