2 papers
math.GT2026
Topological classification of certain nonorientable 4-manifolds with cyclic fundamental group of order 2 mod 4
Rafael Torres
We show that the classification up to homeomorphism of closed topological nonorientable 4-manifolds with fundamental group of order 2 due to Hambleton-Kreck-Teichner can be used to…
math.GT2025
Exotic non-orientable four-manifolds with prescribed fundamental group
Rafael Torres
We show that any finitely presented group with an index two subgroup is realized as the fundamental group of a closed smooth non-orientable four-manifold that admits an exotic smoo…