BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Mark Gibson DTSTART:20250220T173000Z DTEND:20250220T190000Z DTSTAMP:20260421T115240Z UID:BC-Math/20 DESCRIPTION:Title: Why Donuts Aren't Donut Holes and Other Important Topological Distinction s\nby Mark Gibson as part of Brooklyn College Math Department Events\n \nLecture held in 1146 Ingersoll.\n\nAbstract\nThis talk provides an acces sible introduction to the world of topology\, focusing on the classificati on of surfaces. We'll explore the key topological invariants—boundary\, Euler characteristic\, and orientability—that distinguish one surface fr om another. We will then uncover a classification theorem for closed surfa ces\, demonstrating that every such surface is topologically equivalent to a sphere\, a connected sum of tori\, or a connected sum of projective pla nes. (Remarkably\, the modern formulation of this theorem dates back 100 years.) No prior knowledge of topology is assumed\, making this talk suita ble for students of all levels.\n\nFood and refreshments will be served.\n LOCATION:https://researchseminars.org/talk/BC-Math/20/ END:VEVENT END:VCALENDAR