Hello everybody, SUMS is returning to weekly talks after taking a break last week to run the Puzzle Hunt. Speaking of which, the Hunt was amazing! Easily our biggest event of the year so far. For those that entered teams, thank you so much for being a part of something that we really put a lot of time and effort into, it means a great deal to us to see so many participants (254 teams!!!!). With that being said, this week we have a interesting talk by another special speaker. Jonathan Sun has taken time off from working on his PhD at the University of Chicago, to talk about the Poincaré Conjecture. As you may well know, the Poincaré Conjecture is one of the Millenium Problems with a million dollar prize offered by the CLAY Institute for its proof (or disproof), much like the P=NP Problem of which there was a SUMS talk last semester, however in this case the Poincaré Conjecture has been solved! For those wondering, the Poincaré Conjecture states that every simply connected, closed 3-manifold is homeomorphic to the 3-sphere. Jonathan will explain what this actually means, talk about its history and background, as well as how it was proved, which is sure to provide for a fascinating talk. Talk: The Poincaré Conjecture Speaker: Jonathan Sun Location: Carslaw 350 Date/Time: Wednesday September 9, 1-2pm I hope to see you there! BTW, stay tuned for more exciting events coming up! SUMS President