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math.AT2004
Braid groups, free groups, and the loop space of the 2-sphere
F. R. Cohen, J. Wu
The purpose of this article is to describe connections between the loop space of the 2-sphere, Artin's braid groups, a choice of simplicial group whose homotopy groups are given by…
math.AT2003★ 3 cited
Orbit configuration spaces associated to discrete subgroups of PSL(2,R)
Frederick R. Cohen, Toshitake Kohno, Miguel A. Xicotencatl
The purpose of this article is to analyze several Lie algebras associated to "orbit configuration spaces" obtained from a group G acting freely, and properly discontinuously on the…