Charming Proofs: A Journey into Elegant Mathematics (Dolciani Mathematical Expositions)

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ISBN-13: 978-0883853481
ISBN-10: 0883853485
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Editorial Reviews

Review

On the first page of the preface of their new and lovely book, "Charming Proofs," Claudi Alsina and Roger Nelsen remind us of The Book that Paul Erdos was fond of invoking when he found a particularly beautiful theorem and proof. This was God's book, containing the most elegant mathematics; and to say something was straight from the Book was the greatest compliment of all. To me Claudi Alsina and Roger Nelsen deserve their own place in the Book of mathematical expositors. Time and again, book after book, they have given us reminders of why we became mathematicians. And for me this book is the topping on the cake. Proof after proof, reminded me of my earliest days studying mathematics and marveling at its beauty. The authors have exquisite taste. I believe anyone who went on to do serious mathematics will find one of their favorites here, lovingly presented. In short, this is a charming book, by charming authors about charming proofs. Every new book they write is a cause for celebration. --Sol Garfunkel, Executive Director, COMAP

What is a charming proof? Alsina (Polytechnic Univ. of Catalonia, Spain) and Nelsen (Lewis and Clark College) cite D. Schattschneider ("Beauty and Truth in Mathematics") in Mathematics and the Aesthetic, edited by N. Sinclair, D. Pimm, and W. Higginson (CH, Jul'07, 44-6282): such a proof should exhibit elegance, ingenuity, and insight, and it should provide connections and paradigms. A charming proof should be eligible for inclusion in Erdos's mythical "book," which contains the most perfect proofs possible of all mathematical results. M. Aigner and G. Ziegler's Proofs from the Book (4th ed., 2010) contains a sampling of such proofs, and the book under review, even though there is some overlap, provides more. The overall flavor here is more geometric and visual, and less analytic, than Aigner and Ziegler's work. Each chapter provides challenge exercises with solutions. A brief listing of section topics includes triangulation of convex polygons, the Erdos-Mordell inequality, an angle-trisecting cone, the quadratrix of Hippias, and the Wallis product. Not surprisingly, the charm of the contents means that in sum this is a charming book. It would be a good supplement to introduction-to-proof courses, as well as topics for discussions in mathematics clubs. Summing Up: Highly recommended. Lower- and upper-division undergraduates and general readers. --D. Robbins Trinity College, CHOICE Magazine

This is a collection of remarkable proofs, all using elementary mathematical or geometrical arguments, and all very simple but often extraordinarily powerful. While some will be well known, I imagine that almost every reader will find material here that they have not encountered before.

Although the book is a mathematics book, I feel sure that some of the theorems would have direct relevance to statistics. For example, how about: for any even number of different points distributed inside a circle it is always possible to draw a line across the circle missing every point and such that exactly half lie on each side of the line. Surely this can find application in segmentation analysis, for applications in marketing and other areas.

In addition to the proofs themselves, there are over 130 "challenges" aimed at stimulating the reader to create similar such "charming proofs." Solutions to these challenges appear at the end of the book.

I cannot help but feel that working carefully through the proofs in this book would materially improve one's creative powers and ability to think laterally. --David J. Hand, International Statistical Review

Given my joyful experiences of exploring challenging problems in middle school and in high school I have a soft spot for elegant problems that are accessible to motivated students who don't have any background in advanced mathematics. And, I have a soft spot for MAA books because they were among the first math books I devoured, specifically their MAA contest prep books. What I particularly enjoy about Charming Proofs is its mix of excellent writing, great illustrations, and interesting yet accessible problems. To be honest, this is the case with every MAA problem-solving book I can think of. I may be biased but I suspect that many would agree with my overall assessment of MAA books of this type. Here are some interesting challenges from the book: Prove that the vertex angles of any star pentagon sum to 180 degrees. Is it possible to construct an equilateral lattice triangle? Does a version of Pick's Theorem hold for three-dimensional lattice polyhedra? Prove that Heron's formula and the Pythagorean theorem are equivalent. Is it true that three times the sum of three squares is always a sum of four squares? Prover there are infinitely many dissection proofs of the Pythagorean theorem. Charming Proofs is one of those great books that you can pick up, choose a chapter that strikes your fancy, work through the chapter, then be rewarded with a number of challenging problems to explore. I should warn you that the book is biased towards geometric and visual problems rather than analytical ones. This makes sense given that visual problems lend themselves better to charming (visual) solutions. I'd like to address the concern that some people have with the price of MAA books. This book, for example, lists for nearly $60 USD. This is certainly more expensive than any popular math book written for the general public. From that perspective the book is indeed expensive. But, if you consider the other extreme, math text books that can retail for $100 or more, Charming Proofs is inexpensive. Whether the book is expensive or not, I believe, depends on how you're going to use the book. If you're going to use the book as a text and teach yourself the material, and Charming Proofs is of textbook quality, then you're looking at a $60 textbook. If you're looking for a more casual involvement with a book then you can see if your library can get you a copy. Many libraries have partnerships with libraries throughout the country and can get you many books that they don't hold. In this particular case, Amazon.com sells the book for as little as $21.99 (new) from their partners so the cost is not prohibitive. For those of you interested in a review of Charming Proofs from a mathematician's perspective I heartily recommend Alex Bogomolyny's review at Cut the Knot. --Sol, Making Math fun and accessible

Book Description

Charming Proofs presents a collection of remarkable proofs in elementary mathematics that are exceptionally elegant. By means of a surprising argument or powerful visual representation, the proofs invite the reader to enjoy the beauty of mathematics and to develop the ability to create proofs themselves.
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Product Details

  • Series: Dolciani Mathematical Expositions
  • Hardcover: 295 pages
  • Publisher: Mathematical Association of America (August 18, 2010)
  • Language: English
  • ISBN-10: 0883853485
  • ISBN-13: 978-0883853481
  • Product Dimensions: 6 x 0.9 x 9 inches
  • Shipping Weight: 1.2 pounds (View shipping rates and policies)
  • Average Customer Review: 5.0 out of 5 stars  See all reviews (1 customer review)
  • Amazon Best Sellers Rank: #1,145,961 in Books (See Top 100 in Books)

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Most Helpful Customer Reviews

6 of 9 people found the following review helpful By Felicity on February 4, 2012
Format: Hardcover
This is an enjoyable, challenging, and well-written book! It complements my study of pure math and introduces me to many fields of math. The answers are in the back of the book to the challenges, but I would recommend not looking until you finish!
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