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.
Articles by others on the same topic
There are currently no matching articles.