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arXiv 0901.2621math.ATmath.CO
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关于Alexandroff空间的同伦型

On homotopy types of Alexandroff spaces

Michał Kukieła

摘要:

推广了R. E. Stong关于有限空间到Alexandroff空间的更广泛的子类。这些定理包括关于函数空间、核和同伦型的定理。特别地,我们刻画了空间对X,Y,使得C(X,Y)上的紧开拓扑是Alexandroff,引入了有限路和有界路空间类,证明了每个有界路空间和每个可数有限路空间都有一个核作为其强形变收缩核.此外,两个有界路或可数有限路空间同伦等价当且仅当它们的核同胚。证明了局部有限空间和高度为1的空间的核和同伦型的一些结果。我们还讨论了F.G.阿里纳斯在亚历山德罗夫空间。指出G. Minian和J. Barmak关于有限空间的弱同伦型的结果和R. E. Stong在有限H-空间和从紧多面体到有限空间的映射上对更广泛的Alexandroff空间类都成立。由于T_0 Alexandroff空间范畴等价于偏序集范畴,我们的结果可能会导致对无限偏序集核概念的更深入理解。

英文摘要:

We generalise some results of R. E. Stong concerning finite spaces to wider subclasses of Alexandroff spaces. These include theorems on function spaces, cores and homotopy type. In particular, we characterize pairs of spaces X,Y such that the compact-open topology on C(X,Y) is Alexandroff, introduce the classes of finite-paths and bounded-paths spaces and show that every bounded-paths space and every countable finite-paths space has a core as its strong deformation retract. Moreover, two bounded-paths or countable finite-paths spaces are homotopy equivalent if and only if their cores are homeomorphic. Some results are proved concerning cores and homotopy type of locally finite spaces and spaces of height 1. We also discuss a mistake found in an article of F.G. Arenas on Alexandroff spaces. It is noted that some theorems of G. Minian and J. Barmak concerning the weak homotopy type of finite spaces and the results of R. E. Stong on finite H-spaces and maps from compact polyhedrons to finite spaces do hold for wider classes of Alexandroff spaces. Since the category of T_0 Alexandroff spaces is equivalent to the category of posets, our results may lead to a deeper understanding of the notion of a core of an infinite poset.

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