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

Mathematician's Delight

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

Inequalities: A Mathematical Olympiad Approach

The Joy Of X: A Guided Tour of Math, from One to Infinity

Essential Linear Algebra with Applications: A Problem-Solving Approach

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

An Introduction to Diophantine Equations: A Problem-Based Approach

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

Mathematical Olympiad Treasures: Edition 2

An Introductory Course in Elementary Number Theory

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

Basic Math & Pre-Algebra For Dummies: Edition 2

Mathematical Olympiad Challenges

Ramanujan's Lost Notebook: Part I, Part 1

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

Challenging Problems in Geometry