Abstract
The congruence subgroups of braid groups arise from a congruence condition on the integral Burau representation B n → G L n ( Z ) B_n \to GL_{n}(\mathbb {Z}) . We find the image of such congruence subgroups in G L n ( Z ) GL_{n}(\mathbb {Z}) —an open problem posed by Dan Margalit. Additionally, we characterize the quotients of braid groups by their congruence subgroups in terms of symplectic congruence subgroups.
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More From: Proceedings of the American Mathematical Society, Series B
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