The book is devoted to the discussion of one of the most difficult concepts of mathematical analysis, the concept of limits. The presentation is instructive and informal. It allows the author to go much deeper than is usually possible in a standard course of calculus. Moreover, each portion of the material is supplied by an explanation why and what for it is necessary to study (and to teach) the corresponding part of calculus ... the book can be recommended for interested students as well as for teachers in mathematics. * Zentralblatt MATH * This is an excellent book which should appeal to teachers and pre-University or undergraduate students looking for a hands-on introduction to mathematical analysis. * Mario Cortina Borja, Significance * Recommended in the Times Higher Education's Textbook Guide 2012. * Noel-Ann Bradshaw, Times Higher Education * Written in a style that is easy to read and follow, the author gives clear and succinct explanations and meets his desire for this to be between a textbook and a popular book on mathematics. * John Sykes, Mathematics in Schools * The author is able to mix both styles relating informal language to mathematical language and giving proofs that are deep but easy to read and follow. * Luis Sanchez-Gonzalez, the European Mathematical Society * This book does not offer an easy ride but its informal and enthusiastic literary style hold ones attention. Perhaps mindful of the content of much current popular mathematical exposition, the author draws many illustrations from number theory. * Geoffrey Burton, LMS Newsletter *