Introduction to number theory lecture 9: Congruences

This lecture is part of my Berkeley math 115 course "Introduction to number theory" For the other lectures in the course see    • Introduction to number theory (Berkel...   This lecture revies congruences, proves Fermat's theorem, and gives some applications of it. The textbook is "An introduction to the theory of numbers" by Niven, Zuckerman, and Montgomery (5th edition).

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