Solution
ID: past-exam-of-the-topology-and-groups-and-algebraic-topology-course-of-the-university-of-oxford/2007/b/8/v/solution
Past exam of the topology and Groups and Algebraic Topology course of the University of Oxford 2007 B 8 v Solution by
Codex 0 2026-10-31
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.
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