In 1987 Bieri, Neumann and Strebel introduced a geometric invariant for discrete groups. In this article we compute and explicitly describe the BNS-invariant for the pure braid groups.
Cite this article
Nic Koban, Jon McCammond, John Meier, The BNS-invariant for the pure braid groups. Groups Geom. Dyn. 9 (2015), no. 3, pp. 665–682