<a href="https://www.youtube.com/watch?v=K1EG_ryMbzM">Video</a> of the lecture.<br>
<a href="https://www.youtube.com/watch?v=RnNLHDQAjRs">Waiting room video</a>: Timothy Gowers talking about the work of John Milnor.<br><br>

Defined the Euler characteristix &chi;(X) of a space X to be the Euler characteristic &chi;(K) of any simplicial complex K with |K| homeomorphic to X. Stated the theorem that is needed to make sure this definition is well-defined.

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Gave some triangulations of a circle, torus, M&ouml;bius strip, 2-sphere and computed the Euler characteristic of these spaces from the triangulation.

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Talked briefly about the Hauptvermutung.