<a href="https://www.youtube.com/watch?v=qPQjTr1GEaw">Video</a> of the lecture.<br>
<a href="https://www.youtube.com/watch?v=aqyyhhnGraw">Waiting room video</a>: Numberphile on knot theory.<br><br>

Introduced the notion of a simplicial complex K, and explained that a triangulation of a topological space X consists of a simplicial complex together with a homeomorphism h:|K| ---> X.