Algebraic & Geometric Topology
- Algebr. Geom. Topol.
- Volume 1, Number 2 (2001), 699-708.
The mapping class group of a genus two surface is linear
In this paper we construct a faithful representation of the mapping class group of the genus two surface into a group of matrices over the complex numbers. Our starting point is the Lawrence–Krammer representation of the braid group , which was shown to be faithful by Bigelow and Krammer. We obtain a faithful representation of the mapping class group of the –punctured sphere by using the close relationship between this group and . We then extend this to a faithful representation of the mapping class group of the genus two surface, using Birman and Hilden’s result that this group is a central extension of the mapping class group of the –punctured sphere. The resulting representation has dimension sixty-four and will be described explicitly. In closing we will remark on subgroups of mapping class groups which can be shown to be linear using similar techniques.
Algebr. Geom. Topol., Volume 1, Number 2 (2001), 699-708.
Received: 2 August 2001
Revised: 15 November 2001
Accepted: 16 November 2001
First available in Project Euclid: 21 December 2017
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Bigelow, Stephen; Budney, Ryan. The mapping class group of a genus two surface is linear. Algebr. Geom. Topol. 1 (2001), no. 2, 699--708. doi:10.2140/agt.2001.1.699. https://projecteuclid.org/euclid.agt/1513882644