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It is a remarkable fact that the group of orientationpreserving isometries of can be identified with the group of biholomorphisms of the unit disk in . [Fun fact: PoincarĂ© said that he discovered (basically) this while stepping on a bus.] … Continue reading
Based on a joint work with Rob Clancy, presented at the Oxford Mathematical Cake Seminar. You might think that this is just a regular cake. But it’s not! The icing is in the shape of a trefoil knot, so that … Continue reading