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AlgTop18: Classification of combinatorial surfaces (II)

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 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: 01:00:21

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