Solution

ID: past-exam-of-the-topology-and-groups-and-algebraic-topology-course-of-the-university-of-oxford/2007/b/8/v/solution

Yes: real projective three-space has these groups. Its usual cell structure has one cell in each dimension zero through three, with boundary maps , and . Hence its integral homology is in degrees zero and three, in degree one, and zero in degree two. It is a connected closed oriented manifold: the antipodal map on preserves orientation, so the sphere's orientation descends to the quotient.

New to topics? Read the docs here!