Lecture 10: Fermat's Theorem in Number Theory

This lecture is part of my Berkeley math 115 course "Introduction to number theory" For the other lectures in the course see https://www.youtube.com/playlist?list=PL8yHsr3EFj53L8sMbzIhhXSAOpuZ1Fov8 We prove Fermat's theorem about powers mod p. The textbook is "An introduction to the theory of numbers" by Niven, Zuckerman, and Montgomery (5th edition).