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math.GT2020
Coarse Alexander duality for pairs and applications
G. Christopher Hruska, Emily Stark, Hung Cong Tran
For a group (of type ) acting properly on a coarse Poincaré duality space , Kapovich-Kleiner introduced a coarse version of Alexander duality between and its compleme…
math.GT2017
Surface group amalgams that (don't) act on 3-manifolds
G. Christopher Hruska, Emily Stark, Hung Cong Tran
We determine which amalgamated products of surface groups identified over multiples of simple closed curves are not fundamental groups of 3-manifolds. We prove each surface amalgam…