Designed for an undergraduate course or for independent study, this textbook presents sophisticated mathematical ideas in an elementary and friendly fashion. It features techniques to solve proofs as well as exercises of varying difficulty.

Designed for an undergraduate course or for independent study, this text presents sophisticated mathematical ideas in an elementary and friendly fashion. The fundamental purpose of this book is to teach mathematical thinking while conveying the beauty and elegance of mathematics. The book contains a large number of exercises of varying difficulty, some of which are designed to help reinforce basic concepts and others of which will challenge virtually all readers. The sole prerequisite for reading this text is high school algebra. Topics covered include: mathematical induction modular arithmetic the Fundamental Theorem of Arithmetic Fermat's Little Theorem RSA encryption the Euclidean algorithm rational and irrational numbers complex numbers cardinality Euclidean plane geometry constructibility (including a proof that an angle of 60 degrees cannot be trisected with a straightedge and compass) infinite series * higher dimensional spaces.

This textbook is suitable for a wide variety of courses and for a broad range of students of mathematics and other subjects. Mathematically inclined senior high school students will also be able to read this book.

From the reviews of the first edition:

It is carefully written in a precise but readable and engaging style I thoroughly enjoyed reading this recent addition to the Springer Undergraduate Texts in Mathematics series and commend this clear, well-organised, unfussy text to its target audiences. (Nick Lord, The Mathematical Gazette, Vol. 100 (547), 2016)

The book is an introduction to real mathematics and is very readable. The book is indeed a joy to read, and would be an excellent text for an 'appreciation of mathematics' course, among other possibilities. (G.A. Heuer, Mathematical Reviews, February, 2015)

Many a benighted book misguidedly addresses the need [to teach mathematical thinking] by framing reasoning, or narrowly, proof, not as pervasive modality but somehow as itself an autonomous mathematical subject. Fortunately, the present book gets it right.... [presenting] well-chosen, basic, conceptual mathematics, suitably accessible after a K-12 education, in a detailed, self-conscious way that emphasizes methodology alongside content and crucially leads to an ultimate clear payoff. Summing Up: Recommended. Lower-division undergraduates and two-year technical program students; general readers. (D.V. Feldman, Choice, Vol. 52 (6), February, 2015)

Presents sophisticated ideas in algebra and geometry in an elementary fashion Includes exercises of varying difficulty to help motivate and teach the reader Solutions to selected exercises are freely available in PDF

Autorentext
Daniel Rosenthal obtained his mathematics degree from the University of Toronto.
David Rosenthal is Professor of Mathematics at St. John's University in New York City.
**Peter Rosenthal** is Professor Emeritus of Mathematics at the University of Toronto.

Inhalt
Preface to the Second Edition.- Preface for Readers.- Preface for Instructors.- 1. Introduction to the Natural Numbers.- 2. Mathematical Induction.- 3. Modular Arithmetic.- 4. The Fundamental Theorem of Arithmetic.- 5. Fermat's Theorem and Wilson's Theorem.- 6. Sending and Receiving Coded Messages.- 7. The Euclidean Algorithm and Applications.- 8. Rational Numbers and Irrational Numbers.- 9. The Complex Numbers.- 10. Sizes of Infinite Sets.- 11. Fundamentals of Euclidean Plane Geometry.- 12. Constructability.- 13. An Introduction to Infinite Series.- 14. Some Higher Dimensional Spaces.- Index.