Braid Groups are Linear
Abstract
The braid groups Bn can be defined as the mapping class group of the n-punctured disc. The Lawrence-Krammer representation of the braid group Bn is the induced action on a certain twisted second homology of the space of unordered pairs of points in the n-punctured disc. Recently, Daan Krammer showed that this is a faithful representation in the case n=4. In this paper, we show that it is faithful for all n.
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