Regular Algebra and Finite Machines

A Beginner's Guide to Constructing the Universe: The Mathematical Archetypes of Nature, Art, and Science

On Numbers and Games

An Introductory Course in Elementary Number Theory

Notebooks of Srinivasa Ramanujan: Volume II, Volume 2

On Quaternions and Octonions

How Numbers Work: Discover the strange and beautiful world of mathematics

Winning Ways for Your Mathematical Plays, Volume 4: Edition 2

A History of Pi

The Symmetries of Things

Complex Numbers from A to ... Z: Edition 2

The Magic Theorem: A Greatly-Expanded, Much-Abridged Edition of The Symmetries of Things

Number Theory: Structures, Examples, and Problems

Ramanujan's Place in the World of Mathematics: Essays Providing a Comparative Study

Proof and the Art of Mathematics

My Search for Ramanujan: How I Learned to Count

Class Groups of Number Fields and Related Topics