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Nonplussed!: Mathematical Proof of Implausible Ideas Hardcover – April 8, 2007
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Math―the application of reasonable logic to reasonable assumptions―usually produces reasonable results. But sometimes math generates astonishing paradoxes―conclusions that seem completely unreasonable or just plain impossible but that are nevertheless demonstrably true. Did you know that a losing sports team can become a winning one by adding worse players than its opponents? Or that the thirteenth of the month is more likely to be a Friday than any other day? Or that cones can roll unaided uphill? In Nonplussed!―a delightfully eclectic collection of paradoxes from many different areas of math―popular-math writer Julian Havil reveals the math that shows the truth of these and many other unbelievable ideas.
Nonplussed! pays special attention to problems from probability and statistics, areas where intuition can easily be wrong. These problems include the vagaries of tennis scoring, what can be deduced from tossing a needle, and disadvantageous games that form winning combinations. Other chapters address everything from the historically important Torricelli's Trumpet to the mind-warping implications of objects that live on high dimensions. Readers learn about the colorful history and people associated with many of these problems in addition to their mathematical proofs.
Nonplussed! will appeal to anyone with a calculus background who enjoys popular math books or puzzles.
- Print length216 pages
- LanguageEnglish
- PublisherPrinceton University Press
- Publication dateApril 8, 2007
- Dimensions6.5 x 1 x 9.5 inches
- ISBN-100691120560
- ISBN-13978-0691120560
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Editorial Reviews
Review
"This is a splendid collection of articles, inspired by Martin Gardner's writings. Old conundrums are given new twists and applications, newer perplexing ideas are described with panache. The forthcoming companion book has a high standard to maintain."---John Haigh, London Mathematical Society Newsletter
"It is therefore recommended that Julian Havil's headmaster award him further sabbatical leave for the purpose of producing a sequel to this welcome addition to the mathematical literature."---Peter Ruane, MAA Review
"A review of a book as good as this must either repeat the positive adjectives other reviewers have used, or require a very large thesaurus. Since I find myself in complete agreement with all of the following words from other reviews, I will repeat them immediately: marvelous, crystal-clear, great, amazing, stimulating, delightful, fascinating, strong, surprising, classic, interesting, eclectic, insightful, magnificent. That one book could encourage such gushing praise seems as unlikely as one book being able to cram in a great variety and depth of mathematical problems, colourful historical anecdotes, significant nods to ethno-mathematics, difficult but well-explained proofs, clear and engaging prose and beautiful diagrams. Yet Havil's book succeeds on all accounts...The brilliant writing, the wonderful problems, the weaving together of past and future, games and discovery, and world number cultures will have you returning to this ageless book time and again."---Phil Wilson, Plus Magazine
"This fascinating expedition by Havil through some engaging and often surprising mathematical and statistical oddities is more demanding than the usual 'popular math book' it is billed...All topics are covered by an always carefully crafted mathematical exposition, not leaving out necessary preliminaries and providing rigorous proofs."---J. Mayer, Choice
"Even many high school students without a calculus background will benefit from the problems contained in the book. . . . The book contains a little algebra, some geometry, and a great deal of probability. It could serve as recreational reading for teachers as well as for student use in a probability course or courses following algebra 2. Mathematics clubs and teams would also find Nonplussed! useful."---Paul Kelley, Mathematics Teacher
"This is a fun book containing many diverse problems that I had not seen before but it also stimulates some genuinely interesting mathematical thought. Above all, this book highlights the 'frailty of the intuition we routinely use to guide us through our everyday lives' and that, in my mind, is no bad thing."---Nathan Green, Mathematics Today
"I recommend the book to everyone interested in entertaining mathematics."---Christina Birkenhake, Mathematical Intelligencer
"This book discusses such problems in a generally accessible way, but it does not shy away from using rigorous mathematical arguments to explain them. . . . Some of these topics are quite familiar, but even so I found the discussions clear and often learned some new and quite surprising tidbits."---Stan Wagon, Mathematical Reviews
"Those that spend their working lives avoiding mathematics by approaching their problems in all sorts of different ways will benefit from looking at this text, even if it involves following through but one single problem and its mathematical solution."---C.J.H. Mann, Kybernetes
"The book is perfect for independent or group study for students in advanced high school mathematics classes or university-level undergraduate mathematics classes. Selected chapters are suitable for discussion during professional development sessions aimed at engaging mathematics teachers in rigorous mathematics investigations and discussions."---Anne Papakonstantinou, Mathematics Teacher
"This lovely book will attract the attention of readers who are interested in recreational mathematics like mathematical puzzles and paradoxes."---Yuri V. Rogovchenko, Zentralblatt MATH
"Havil has an excellent mix of an interesting history of each topic and clear and lucid solutions to the problems. . . . Havil's strength is the historical background he gives to each topic and his style of writing which is so easy to read. . . . An interesting and challenging book well worth reading."---John Sykes, Mathematics in School
Review
"In Nonplussed!, his new book of fascinating discussions of mathematical questions, Julian Havil's literary signature is evident even without seeing his name on the cover. The presentation always displays his strong ability to weave together the historical with what is often a surprising mathematical twist, even for those problems that have been around long enough to be called classic. Nonplussed! will be a classic, too."―Paul J. Nahin, author of Dr. Euler's Fabulous Formula
"Nonplussed!! is a very interesting and eclectic mix of paradoxes that has the potential to be a very useful and lasting contribution to popular mathematics."―Christopher J. Sangwin, author of Mathematics Galore
"I greatly enjoyed this book and I imagine that anyone who liked high school math will too. Nonplussed! certainly succeeds in surprising-and in giving insightful proofs of the mathematical results discussed. It is a magnificent demonstration of how far even rather straightforward mathematics can take you. And by describing many of the historical characters involved and the problems that motivated them, it makes mathematics seem like an adventure."―Nick Huggett, author of Space from Zeno to Einstein
From the Inside Flap
"Nonplussed!, as the title suggests, is a marvelous study of some two dozen choice mathematical problems that boggle the mind. Unlike so many books on recreational math, Havil doesn't hesitate to give crystal-clear proofs and their necessary equations. John Conway's great checker-jumping puzzle is here, along with amazing nontransitive betting paradoxes and other confounding results almost impossible to believe. No one interested in recreational mathematics on an intermediate advanced level should pass up this stimulating, delightful volume."--Martin Gardner
"In Nonplussed!, his new book of fascinating discussions of mathematical questions, Julian Havil's literary signature is evident even without seeing his name on the cover. The presentation always displays his strong ability to weave together the historical with what is often a surprising mathematical twist, even for those problems that have been around long enough to be called classic. Nonplussed! will be a classic, too."--Paul J. Nahin, author of Dr. Euler's Fabulous Formula
"Nonplussed!! is a very interesting and eclectic mix of paradoxes that has the potential to be a very useful and lasting contribution to popular mathematics."--Christopher J. Sangwin, author of Mathematics Galore
"I greatly enjoyed this book and I imagine that anyone who liked high school math will too. Nonplussed! certainly succeeds in surprising-and in giving insightful proofs of the mathematical results discussed. It is a magnificent demonstration of how far even rather straightforward mathematics can take you. And by describing many of the historical characters involved and the problems that motivated them, it makes mathematics seem like an adventure."--Nick Huggett, author of Space from Zeno to Einstein
From the Back Cover
"Nonplussed!, as the title suggests, is a marvelous study of some two dozen choice mathematical problems that boggle the mind. Unlike so many books on recreational math, Havil doesn't hesitate to give crystal-clear proofs and their necessary equations. John Conway's great checker-jumping puzzle is here, along with amazing nontransitive betting paradoxes and other confounding results almost impossible to believe. No one interested in recreational mathematics on an intermediate advanced level should pass up this stimulating, delightful volume."--Martin Gardner
"In Nonplussed!, his new book of fascinating discussions of mathematical questions, Julian Havil's literary signature is evident even without seeing his name on the cover. The presentation always displays his strong ability to weave together the historical with what is often a surprising mathematical twist, even for those problems that have been around long enough to be called classic. Nonplussed! will be a classic, too."--Paul J. Nahin, author ofDr. Euler's Fabulous Formula
"Nonplussed!! is a very interesting and eclectic mix of paradoxes that has the potential to be a very useful and lasting contribution to popular mathematics."--Christopher J. Sangwin, author ofMathematics Galore
"I greatly enjoyed this book and I imagine that anyone who liked high school math will too.Nonplussed! certainly succeeds in surprising-and in giving insightful proofs of the mathematical results discussed. It is a magnificent demonstration of how far even rather straightforward mathematics can take you. And by describing many of the historical characters involved and the problems that motivated them, it makes mathematics seem like an adventure."--Nick Huggett, author ofSpace from Zeno to Einstein
About the Author
Product details
- Publisher : Princeton University Press; First Edition (April 8, 2007)
- Language : English
- Hardcover : 216 pages
- ISBN-10 : 0691120560
- ISBN-13 : 978-0691120560
- Item Weight : 1 pounds
- Dimensions : 6.5 x 1 x 9.5 inches
- Best Sellers Rank: #3,213,260 in Books (See Top 100 in Books)
- #1,838 in Math Games
- #12,133 in Applied Mathematics (Books)
- #14,069 in Technology (Books)
- Customer Reviews:
About the author

Finally I have decided to 'get a web page' and, thanks to Amazon,the procedure is very easy. I will try to add to it as time passes.
And so for some time I have failed to add anything useful on this page, for which I apologise. My hope is that the readers of my books will gain something of what I have gained by writing them. I do apologise for errors and omissions but have no control over Kindle versions, which seem worthy of typographical criticism. My current project is a book with working title 'Features of a Mathematical Landscape", which I hope will intrigue the intended reader... The last book, Curves for the Mathematically Curious, has met with a pretty positive response, for which I am most grateful. I am also grateful for support, as I am grateful for constructive criticism. If you have ideas for a book that would be appropriate for me to write, do say so.
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One minor complaint is that I found some typesetting errors. One, ironically, occurs on page 49 where he uses the notation "!n" (the number of derangements of n objects) when actually he meant "n!" (the number of permutations of n objects). It's ironic because only two paragraphs later Havil warns that !n can be easily confused with n!, whereupon he adopts a new notation for !n. In the delightfully bizarre but challenging chapter on John Conway's Fractran, there are a few typos that might confuse that minority of readers who will actually try to go line-by-line through the explanation of the Fractran machine (p. 172), but if you're one of those people, discovering the errors will anyway prove your mastery.
From the first chapter on the two coin problem, I knew I was in trouble when I could not figure out from the exposition what the correct answer is. After being put off by the notation on the tennis problems which I could not understand and which the author did not disdain to explain and daunted by the complex mathematics involved (despite the author's assurance that some high school mathematics is all that is needed) I gave up.
This type of conceited garbage writing about one of the greatest discplines is what has given mathematics the bad name it has. Perhaps, Mr. Havil should have beta-tested the book rather than rushing inconsiderately into print.
In short, I looked foward to an entertaining and informative discussion of counterintuitiveness and I ended up regretting my purchase of the booik and my knowledge of its existence.
Robert Allen
People loving Martin Gardner's articles in Scientific American, will certainly appreciate this book.
For example, Havil shows, with impeccable mathematics, that if a given player has over 91.9643...% probability of winning any given point on his or her serve, that he or she has a higher likelihood of winning at the start of the game than when the score is 30-15 or 40-30. He uses this fact to back up a claim that "a high quality tennis player serving at 40-30 or 30-15 to an equal opponent has less chance of winning the game than at its start." Again, this is predicated on that 92% or better percentage of winning any given point. But in real life, high quality tennis players, even when serving, against an equal opponent does not have this high a percentage of the points gained. Take 92% as the percentage. That would mean that over 70% of the time, the non-server would not even get one point (score of 15) during a given game. If anyone watches Wimbledon or the U.S. Open, one sees that such occurrences are rare, not common. As even Havil points out, it also implies that the server will win at least 99.9% of the games. But in high-level play, set scores of 6-3, 6-4, etc. are common. With 99.9% of the games being won by the server, 99.4% of sets would go into tie-break. That's clearly not the case in the real world. But this discrepancy is needed in order to make the "paradox" that creates the "nonplussed" reaction.
In the chapter on the calendar, Havil explains why the Christian feast commemorating Jesus' ascension into Heaven never falls on a Sunday by claiming that that feast is also called Holy Thursday. It's not. It's Ascension Thursday. Holy Thursday, 42 days (six weeks) before Ascension Thursday, is the day before Good Friday, and commemorates the Last Supper.
Top reviews from other countries
Hope Julian Havil will read this someday.


