4 papers
A four-term exact sequence of fundamental groups of orbit configuration spaces
S. K. Roushon
We deduce that the fundamental groups of the orbit configuration spaces of an effective and properly discontinuous action of a discrete group on a connected aspherical 2-manifold,…
The affine Artin group of type is virtually poly-free
Li Li, S. K. Roushon
In this note we prove that the affine Artin group of type is virtually poly-free. The proof also gives another solution of the problem for $\widetilde B…
Configuration Lie groupoids and orbifold braid groups
S K Roushon
We propose two definitions of configuration Lie groupoids and in both the cases we prove a Fadell-Neuwirth type fibration theorem for a class of Lie groupoids. We show that this is…
Almost-quasifibrations and fundamental groups of orbit configuration spaces
S K Roushon
In this article we introduce the notion of a k-almost-quasifibration and give many examples. We also show that a large class of these examples are not quasifibrations. As a consequ…