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刊物类别:Mathematics and Statistics
刊物主题:Mathematics Mathematics
出版者:Birkh盲user Basel
ISSN:1660-5454
文摘
The main results of this paper are: (1) If a space X can be embedded as a cellular subspace of \({\mathbb{R}^n}\) then X admits arbitrary fine open coverings whose nerves are homeomorphic to the n-dimensional cube D n . (2) Every n-dimensional cell-like compactum can be embedded into (2n?+?1)-dimensional Euclidean space as a cellular subset. (3) There exists a locally compact planar set which is acyclic with respect to ?ech homology and whose fine coverings are all nonacyclic.