On the inverse mapping class monoids

Details On the inverse mapping class monoids On the inverse mapping class monoids

2009-02-06

arxiv.org/abs/0902.1178v1

J. Knot Theory, 19, No 2 (2010) 163 -179

Mathematics

Algebraic Topology

13 pages, 2 figures

Scientific paper

Braid groups and mapping class groups have many features in common. Similarly to the notion of inverse braid monoid inverse mapping class monoid is defined. It concerns surfaces with punctures, but among given $n$ punctures several can be omitted. This corresponds to braids where the number of strings is not fixed. In the paper we give the analogue of the Dehn-Nilsen-Baer theorem, propose a presentation of the inverse mapping class monoid for a punctured sphere and study the word problem. This shows that certain properties and objects based on mapping class groups may be extended to the inverse mapping class monoids. We also give an analogues of Artin presentation with two generators.

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