同调维数与齐性ANR空间
Homological dimension and homogeneous ANR spaces
摘要:
Alexandroff引入了度量矩阵的同调维数$d_G$.本文给出了$d_G$的一些一般性质,主要是为了描述紧度量空间的维数满值性。作为$d_G$已有性质的推论,我们证明了任何二维$lc^2$度量紧是维数满值的。这改进了Kodama的众所周知的结果,即每个二维$ANR$都是维满值的。同时给出了齐次度量$ANR$ -Lectta的应用.
英文摘要:
The homological dimension $d_G$ of metric compacta was introduced by Alexandroff. In this paper we provide some general properties of $d_G$, mainly with an eye towards describing the dimensional full-valuedness of compact metric spaces. As a corollary of the established properties of $d_G$, we prove that any two-dimensional $lc^2$ metric compactum is dimensionally full-valued. This improves the well known result of Kodama that every two-dimensional $ANR$ is dimensionally full-valued. Applications for homogeneous metric $ANR$-compacta are also given.
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