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On orthogonal projections of Nöbeling spaces
S. M. Ageev Belarusian State University
Abstract:
Suppose that $0\le k<\infty$. We prove that there is a dense open subset of the Grassmann space
$\operatorname{Gr}(2k+1,m)$ such that the orthogonal projection of the standard Nöbeling space
$N^m_k$ (which lies in $\mathbb R^m$ for sufficiently large $m$) to every $(2k+1)$-dimensional plane
in this subset is $k$-soft and possesses the strong $k$-universal property with respect to Polish spaces.
Every such orthogonal projection is a natural counterpart of the standard Nöbeling space for the category of maps.
Keywords:
Nöbeling space, Dranishnikov and Chigogidze resolutions, strong fibrewise $k$-universal property,
filtered finite-dimensional selection theorem, $\operatorname{AE}(k)$-space.
Received: 02.03.2019 Revised: 01.07.2019
Citation:
S. M. Ageev, “On orthogonal projections of Nöbeling spaces”, Izv. RAN. Ser. Mat., 84:4 (2020), 5–40; Izv. Math., 84:4 (2020), 627–658
Linking options:
https://www.mathnet.ru/eng/im8910https://doi.org/10.1070/IM8910 https://www.mathnet.ru/eng/im/v84/i4/p5
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Abstract page: | 333 | Russian version PDF: | 44 | English version PDF: | 24 | References: | 51 | First page: | 14 |
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