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arXiv 1906.09031math.AT
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非本质有向映射与有向同伦等价

Inessential directed maps and directed homotopy equivalences

Martin Raussen

AI总结:

本文定义非本质有向映射与有向同伦等价,证明其满足2-out-of-3性质,并保持有向拓扑复杂度及诱导配对分量范畴同构。

摘要:

有向空间是一个拓扑空间 $X$ 连同 $X$ 上的有向路径子空间 $\vec{P}(X)\subset X^I$。有向空间的对称性因此应当同时尊重底层空间的拓扑以及关联的从起点($-$)到终点($+$)的有向路径空间 $\vec{P}(X)_-^+$ 的拓扑——直至同伦。此外,如果该对称性在有向意义下同伦于恒等映射,则称其为非本质 d-映射,本文探讨了非本质 d-映射的代数与拓扑性质。将两个有向空间 $X$ 和 $Y$ “在对称性意义下”进行比较,得到了它们之间有向同伦等价的概念。在适当条件下,所有有向同伦等价都被证明满足 2-out-of-3 性质。我们的有向同伦等价概念与 \cite{Goubault:17} 和 \cite{GFS:18} 中定义的不完全一致;这一偏差由实例所驱动。尽管如此,\cite{GFS:18} 中引入的有向拓扑复杂度被证明在我们的有向同伦等价概念下保持不变。最后,我们证明有向同伦等价在 \cite{Raussen:18} 中引入的有向空间的配对分量范畴上诱导出同构。

英文摘要:

A directed space is a topological space $X$ together with a subspace $\vec{P}(X)\subset X^I$ of \emph{directed} paths on $X$. A symmetry of a directed space should therefore respect both the topology of the underlying space and the topology of the associated spaces $\vec{P}(X)_-^+$ of directed paths between a source ($-$) and a target ($+$) - up to homotopy. If it is, moreover, homotopic to the identity map -- in a directed sense -- such a symmetry will be called an inessential d-map, and the paper explores the algebra and topology of inessential d-maps. Comparing two d-spaces $X$ and $Y$ "up to symmetry" yields the notion of a directed homotopy equivalence between them. Under appropriate conditions, all directed homotopy equivalences are shown to satisfy a 2-out-of-3 property. Our notion of directed homotopy equivalence does not agree completely with the one defined in \cite{Goubault:17} and \cite{GFS:18}; the deviation is motivated by examples. Nevertheless, directed topological complexity, introduced in \cite{GFS:18} is shown to be invariant under our notion of directed homotopy equivalence. Finally, we show that directed homotopy equivalences result in isomorphisms on the pair component categories of directed spaces introduced in \cite{Raussen:18}.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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