Number Theory: In Context and Interactive

This chapter does not do any number theory, per se. Yet it is at the heart of the text. We introduce two powerful methods to deal with integers modulo \(n\) – visualizing them graphically, and the language of group theory.

There is no prerequisite in either case; do not feel worried if you have not encountered algebraic structures like groups before. We will only take and introduce what we need, and refer back to fundamental properties often.