### AlgTop19d: An algebraic ZIP proof of the classification (last)

In this lecture we sketch an algebraic version of Conway's ZIP proof of the classification of two-dimensional surfaces. One key idea is to replace the basic polygons in the standard proof with spheres with holes in them. We introduce an algebraic notation that allows us to manipulate (ZIP) edges together between holes on spheres. This is the fourth and final video of the 19th lecture of this beginner's course in Algebraic Topology, given by N J Wildberger of the School of Mathematics and Statistics at UNSW.

Length:
05:34