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What is Pi?

Pi (Greek letter "π") is the symbol used in mathematics to represent a constant -- the ratio of the circumference of a circle to its diameter -- which is approximately 3.14159.

Pi has been calculated to over one trillion digits beyond its decimal point. Since Pi is irrational, the digits in its decimal expansion continue infinitely without repetition. While only a handful of digits are needed for typical calculations, Pi's infinite nature makes it a fun challenge to memorize, and to computationally calculate, more and more digits.

TNP Cover MBK/53  Cover GSM/91  Cover HAPPENING/6 Cover MASS  Cover CHEL/108.H Cover AMSTEXT/21 Cover MCL/1 Cover

Happy Pi Day! 3.14

Receive an extra 25% discount on select Pi Day titles! Use Market Code Pi314 at checkout.
Special pricing is for individuals only. Offer ends 4.14.14.

AMS TextbooksAMS Applications-related Books

Axiomatic Geometry - John M. Lee, University of Washington - AMS, 2013, 469 pp., Hardcover, ISBN-10: 0-8218-8478-6, ISBN-13: 978-0-8218-8478-2, List: US$75, All AMS Members: US$60, AMSTEXT/21 [textbook]
A Decade of the Berkeley Math Circle: The American Experience, Volume I - Zvezdelina Stankova, Mills College, and University of California, Berkeley, and Tom Rike, Oakland High School, Editors - AMS | MSRI, 2008, 326 pp., Softcover, ISBN-10: 0-8218-4683-3, ISBN-13: 978-0-8218-4683-4, List: US$25, Institutional Member: US$20, All Individuals: US$18.75, MCL/1
Graduate Algebra: Noncommutative View - Louis Halle Rowen, Bar-Ilan University - AMS, 2008, 648 pp., Hardcover, ISBN-10: 0-8218-4153-X, ISBN-13: 978-0-8218-4153-2, List: US$89, All AMS Members: US$71.20, GSM/91
Five-Minute Mathematics - Ehrhard Behrends, Freie Universität Berlin - Translated by David Kramer - AMS, 2008, 380 pp., Softcover, ISBN-10: 0-8218-4348-6, ISBN-13: 978-0-8218-4348-2, List: US$38, All AMS Members: US$30.40, MBK/53
What's Happening in the Mathematical Sciences, Volume 6 - Dana Mackenzie and Barry Cipra - AMS, 2006, 122 pp., Softcover, ISBN-10: 0-8218-3585-8, ISBN-13: 978-0-8218-3585-2, List: US$26, All AMS Members: US$20.80, HAPPENING/6
The Number \(\pi\) - Pierre Eymard and Jean-Pierre Lafon - AMS, 2004, 322 pp., Softcover, ISBN-10: 0-8218-3246-8, ISBN-13: 978-0-8218-3246-2, List: US$42, All AMS Members: US$33.60, TNP
MASS Selecta: Teaching and Learning Advanced Undergraduate Mathematics - Svetlana Katok, Alexei Sossinsky, and Serge Tabachnikov, Pennsylvania State University, Editors - AMS, 2003, 313 pp., Hardcover, ISBN-10: 0-8218-3363-4, ISBN-13: 978-0-8218-3363-6, List: US$69, All AMS Members: US$55.20, MASS
Famous Problems and Other Monographs: Second Edition - Felix Klein, W. F. Sheppard, P. A. MacMahon, and J. L. Mordell - AMS, 1962, 321 pp., Hardcover, ISBN-10: 0-8218-2674-3, ISBN-13: 978-0-8218-2674-4, List: US$46, All AMS Members: US$41.40, CHEL/108.H

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