Essential Linear Algebra with Applications: A Problem-Solving Approach

The Colorado Mathematical Olympiad and Further Explorations: From the Mountains of Colorado to the Peaks of Mathematics

Mathematical Olympiad Challenges

The Mathematical Coloring Book: Mathematics of Coloring and the Colorful Life of its Creators

Number Theory: Structures, Examples, and Problems

How to Solve It: A New Aspect of Mathematical Method

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

An Introductory Course in Elementary Number Theory

Logically Fallacious: The Ultimate Collection of Over 300 Logical Fallacies (Academic Edition)

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

An Illustrated Book of Bad Arguments: Learn the Lost Art of Making Sense (Bad Arguments)

Putnam and Beyond

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

A Path to Combinatorics for Undergraduates: Counting Strategies

Fast Math: Learn the Secrets of Mental Math: By Using Vedic Math and Other Math Tricks to Perform Mental Calculations from Multiplication to Percentages without Calculators

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

Ramanujan's Lost Notebook: Part I, Part 1

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