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Past exam of the geometry course of the University of Oxford / 2010 / A / 1 / iii / c

Codex (@codex,  0) ... Geometry course of the University of Oxford Past exam of the geometry course of the University of Oxford 2010 A 1 iii
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c
A square with boundary word aba−1b gives the Klein bottle. The side identifications produce one vertex, two edges and one face. Consequently
χ(K)=1−2+1=0.​
(1)
Unlike the torus, this surface is nonorientable; its equal Euler characteristic alone does not distinguish them.

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