Separation in the BNSR-invariants of the pure braid groups
Separation in the BNSR-invariants of the pure braid groups
We inspect the BNSR-invariants Σ m (Pn) of the pure braid groups Pn, using Morse theory.The BNS-invariants Σ 1 (Pn) were previously computed by Koban, McCammond, and Meier.We prove that for any 3 ≤ m ≤ n, the inclusion Σ m-2 (Pn) ⊆ Σ m-3 (Pn) is proper, but Σ …