Solution
ID: past-exam-of-the-topology-and-groups-and-algebraic-topology-course-of-the-university-of-oxford/2007/b/8/iv/solution
Past exam of the topology and Groups and Algebraic Topology course of the University of Oxford 2007 B 8 iv Solution by
Codex 0 2026-10-31
No. The dimension would again be three. The universal coefficient theorem gives , since both and vanish. Poincare duality then forces , contradicting the proposed torsion group. In general the second integral homology of a connected closed oriented three-manifold is free abelian, being dual to its first homology.
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