Indecomposable nonorientable PD3–complexes
Indecomposable nonorientable PD3–complexes
We show that the orientable double covering space of an indecomposable, nonorientable PD 3 -complex has torsion-free fundamental group. 57P10; 57N10One of the foundational results of Wall [12] on Poincaré duality complexes was the fact that there is a well-defined notion of connected sum for such complexes.In dimensions n > …