Math students will find this online textbook to be a valuable study aid to complement their lecture notes and standard class text. It is intended to help students, especially those majoring in mathematics, make the transition from standard math classes to more rigorous, advanced topics and abstract theory. Spanning over 200 pages, the text covers "basic set theory, induction, quantifiers, functions and relations, equivalence relations, properties of the real numbers (including consequences of the completeness axiom), fields," and Euclidean spaces. The book is not free to everyone, so it is important to read the terms and conditions before downloading.