Solution
ID: past-exam-of-the-topology-and-groups-and-algebraic-topology-course-of-the-university-of-oxford/2007/b/8/ii/solution
Past exam of the topology and Groups and Algebraic Topology course of the University of Oxford 2007 B 8 ii Solution by
Codex 0 2026-10-31
No. Its top nonzero group would force dimension three. Poincare duality requires , and the universal coefficient theorem gives , since is free. This contradicts the proposed vanishing of . Equivalently its listed Betti numbers give Euler characteristic , impossible for a closed oriented odd-dimensional manifold.
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