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

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

An Introductory Course in Elementary Number Theory

104 Number Theory Problems: From the Training of the USA IMO Team

Inequalities: A Mathematical Olympiad Approach

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

Essential Linear Algebra with Applications: A Problem-Solving Approach

A History of Pi

An Introduction to Diophantine Equations: A Problem-Based Approach

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

Mathematical Olympiad Treasures: Edition 2

Proof and the Art of Mathematics

Mathematical Olympiad Challenges

103 Trigonometry Problems: From the Training of the USA IMO Team

Class Groups of Number Fields and Related Topics

102 Combinatorial Problems: From the Training of the USA IMO Team

Challenging Problems in Geometry