Geometric embeddings of braid groups do not merge conjugacy classes
Geometric embeddings of braid groups do not merge conjugacy classes
复制标题
辫子组的几何嵌入不会合并共轭类
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发表时间:
2013
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通讯作者:
J. González
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作者:
J. González
An embedding of the $$m$$m-times punctured disc into the $$n$$n-times punctured disc, for $$n>m$$n>m, yields an embedding of the braid group on $$m$$m strands $$B_m$$Bm into the braid group on $$n$$n strands $$B_n$$Bn, called a geometric embedding. The main example consists of adding $$n-m$$n-m trivial strands to the right of each braid on $$m$$m strands. We show that geometric embeddings do not merge conjugacy classes, meaning that if the images of two elements in $$B_m$$Bm by a geometric embedding are conjugate in $$B_n$$Bn, the original elements are conjugate in $$B_m$$Bm. We also show that the result does not hold, in general, for geometric embeddings of mapping class groups.