Riemannian Geometry

Mind and Nature: Selected Writings on Philosophy, Mathematics, and Physics

The Trachtenberg Speed System of Basic Mathematics

Levels of Infinity: Selected Writings on Mathematics and Philosophy

Continuous Geometry

Secrets of Mental Math: The Mathemagician's Guide to Lightning Calculation and Amazing Math Tricks

Symmetry

Short-Cut Math

Linear Programming and Extensions

Philosophy of Mathematics and Natural Science

Quicker Approach to Quantitative Aptitude: Personal Notes of Sizil Krishna

The Concept of a Riemann Surface

Non-standard Analysis

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

An Introductory Course in Elementary Number Theory

The Magic of Math: Solving for x and Figuring Out Why

Dynamic Programming

Basic Math & Pre-Algebra For Dummies: Edition 2