We study Euler classes in groups of homeomorphisms of Seifert-fibered 3–manifolds. In contrast to the familiar Euler class for Homeo0(S1) as a discrete group, we show that these Euler classes for Homeo0(M3) as a discrete group are unbounded classes. In fact, we give examples of flat topological M–bundles over a genus 3 surface whose Euler class takes arbitrary values.
Keywords: Euler class, Seifert fibered, $3$–manifold, homeomorphism group
Mann, Kathryn  1
@article{10_2140_agt_2020_20_1221,
author = {Mann, Kathryn},
title = {Unboundedness of some higher {Euler} classes},
journal = {Algebraic and Geometric Topology},
pages = {1221--1234},
year = {2020},
volume = {20},
number = {3},
doi = {10.2140/agt.2020.20.1221},
url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2020.20.1221/}
}
Mann, Kathryn. Unboundedness of some higher Euler classes. Algebraic and Geometric Topology, Tome 20 (2020) no. 3, pp. 1221-1234. doi: 10.2140/agt.2020.20.1221
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