Introduction to number theory lecture 49. Dirichlet's theorem

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...

We give an overview of the proof of Dirichlet's theorem, and give some examples of Dirichlet characters.

The textbook is "An introduction to the theory of numbers" by Niven, Zuckerman, and Montgomery (5th edition).

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