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OCTOBER 2004

Review of PI–A Biography of the World’s Most Mysterious Number by Alfred S. Posamentier
& Ingmar Lehmann

by Merri Rosenberg

“Can I read that when you’ve finished?” my husband asked, after circling around me in my recliner as I read this book this past weekend. Normally, my book reviewing assignments don’t interest him in the slightest.

This was obviously different. Perhaps it was only to be expected, as my husband had been on the Stuyvesant High School math team, and read math teaser and games volumes with the same enjoyment that most of us reserve for summer beach books.

If there is anything that adults remember from their earliest studies of mathematics in school, it is the Greek letter Pi (p) used in connection with the famous formula for the area of a circle- pr². However, what most people don’t know is that this ubiquitous number has an extraordinary significance in mathematics and a very interesting history about how it was discovered as well as its value more accurately known through the ages. Would you believe that we now know Pi to 1.24 trillion decimal places?

This book, specifically geared toward the general readership and “clearly appropriate for teachers involved in mathematics instruction in all grade levels,” is written in a very informal and comfortable style with this readership in mind. For example, for the uninitiated, many mathematical terms are defined as they come up through an extensive footnote system.

It’s certainly an impressive piece of scholarship. The authors cover everything from the history of Pi in the ancient world to the most recent efforts by Tokyo University’s professor Yasumasa Kanada’s December 2002 effort to calculate Pi (familiar to most of us as the value of 3.14) to 1.24 trillion decimal places. There are discussions about Pi’s value in the Bible, how the Chinese studied it, even an entertaining section about the various mnemonics, poems, dramas, and jokes that various cultures have developed to remember Pi.

As a non-mathematician, I found the chapters dealing with the applications of Pi–in the starting positions at a track meet, for example, how to allocate fair shares of a pizza, or even how the Chinese symbol for yin/yang owes much to the calculation of Pi–particularly fascinating.

There is something for everyone in this book and everyone should read this book because it will be, for some, a revelation that mathematics can be fun and beautiful- something they may not have realized during earlier encounters. Math teachers will find a host of ideas to enrich their instruction since Pi, as you know, comes up everywhere. The book is highly recommended and should provide a major step towards increasing the popularity of mathematics.#

Alfred S. Posamentier is Dean, School of Education, City College, N.Y. and holds a Ph.D. in Mathematics.
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