Solution

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

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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