Homeotopy groups of leaf spaces of one-dimensional foliations on non-compact surfaces with non-compact leaves
| Autor: | Maksymenko, Sergiy, Polulyakh, Eugene |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Proceedings of the International Geometry Center, vol. 14, no. 4 (2021), 271-290 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.15673/tmgc.v14i4.2204 |
| Popis: | Let $Z$ be a non-compact two-dimensional manifold obtained from a family of open strips $\mathbb{R}\times(0,1)$ with boundary intervals by gluing those strips along some pairs of their boundary intervals. Every such strip has a natural foliation into parallel lines $\mathbb{R}\times t$, $t\in(0,1)$, and boundary intervals which gives a foliation $\Delta$ on all of $Z$. Denote by $\mathcal{H}(Z,\Delta)$ the group of all homeomorphisms of $Z$ that maps leaves of $\Delta$ onto leaves and by $\mathcal{H}(Z/\Delta)$ the group of homeomorphisms of the space of leaves endowed with the corresponding compact open topologies. Recently, the authors identified the homeotopy group $\pi_0\mathcal{H}(Z,\Delta)$ with a group of automorphisms of a certain graph $G$ with the additional structure which encodes the combinatorics of gluing $Z$ from strips. That graph is in a certain sense dual to the space of leaves $Z/\Delta$. On the other hand, for every $h\in\mathcal{H}(Z,\Delta)$ the induced permutation $k$ of leaves of $\Delta$ is in fact a homeomorphism of $Z/\Delta$ and the correspondence $h\mapsto k$ is a homomorphism $\psi:\mathcal{H}(\Delta)\to\mathcal{H}(Z/\Delta)$. The aim of the present paper is to show that $\psi$ induces a homomorphism of the corresponding homeotopy groups $\psi_0:\pi_0\mathcal{H}(Z,\Delta)\to\pi_0\mathcal{H}(Z/\Delta)$ which turns out to be either injective or having a kernel $\mathbb{Z}_2$. This gives a dual description of $\pi_0\mathcal{H}(Z,\Delta)$ in terms of the space of leaves. Comment: AMSart, 15 pages, 1 figure |
| Databáze: | arXiv |
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