The Magic of Ultraproducts
Speaker: BenTitle: The Magic of Ultraproducts
Date: 29 Oct 2020 17:30-18:45 EST (talk starts at 17:45)
Location: Zoom
Food: Self-prepared
Abstract: I’ll introduce the mathematical concept of ultraproducts, which are a way of defining a limit of any sequence of objects. I’ll show how using ultraproducts, you can: (1) come up with a voting system that satisfies all of Arrow’s axioms, as long as the voting population is infinite (2) rigorously define “infinitesimally small” numbers, which can be used to define derivatives and the rest of calculus (3) make your life as a theoretical computer scientist easier* Based on blog posts by Terry Tao. *speculative