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AlgTop18c: Classification of combinatorial surfaces II (cont.)

In this lecture we present the traditional proof of the classification of (two-dimensional) surfaces using a reduction to a normal or standard form. The main idea is to carefully cut and paste the polygons forming the surface in a particular way, creating crosscaps and handles. This is the third video of the 18th lecture of this beginner's course in Algebraic Topology, given by N J Wildberger of the School of Mathematics and Statistics at UNSW.
Length: 14:23

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