# Jian Cheng

Beautiful Theorems and Formulas in Mathematics

Abstract: In this talk I will present some well-known theorems and formulas in mathematics that are considered to be "beautiful". Some classic and elegant proofs will be presented and discussed. Topics will include the Pythagorean Theorem, Fermat's Last Theorem, Euclid's Proof of the Infinitude of Primes, Bertrand's Postulate, $\sqrt{2}$'s Irrationality, Four Color Theorem, Euler's Polyhedron Formula, Euler's Identity, and some series formulas.

Date: 7/14/2017

Time: 2:00PM-3:00PM

Place: 112 Armstrong Hall

All are welcome.