Solution

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

Yes, for a nonnegative integer : the closed orientable surface of genus has precisely these groups. A standard polygon cell structure has one vertex, one-cells and one two-cell attached by a product of commutators. Its integral cellular boundary maps are zero, because each generator occurs once in each orientation in the attaching word. Thus and . At genus zero use the sphere.

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