Number Theory: Structures, Examples, and Problems

Elementary Number Theory: Primes, Congruences, and Secrets: A Computational Approach

Problem-Solving Through Problems

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

How to Solve It: A New Aspect of Mathematical Method

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

Fundamentals of Number Theory

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

An Introductory Course in Elementary Number Theory

Foundations and Fundamental Concepts of Mathematics

A Path to Combinatorics for Undergraduates: Counting Strategies

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

An Introduction to Diophantine Equations: A Problem-Based Approach

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

Essential Linear Algebra with Applications: A Problem-Solving Approach

A Beginner's Guide to Mathematical Logic

Mathematical Olympiad Treasures: Edition 2

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

Mathematical Olympiad Challenges