Poincaré duality in dimension 3
Poincaré duality in dimension 3
The paper gives a review of progress towards extending the Thurston programme to the Poincaré duality case.In the first section, we fix notation and terminology for Poincaré complexes X (with fundamental group G) and pairs, and discuss finiteness conditions.For the case where there is no boundary, π2 is non-zero if …