The Calculus of Friendship: What a Teacher and a Student Learned About Life While Corresponding About Math

The Calculus of Friendship is the story of an extraordinary connection between a teacher and a student, as chronicled through more than thirty years of letters between them. What makes their relationship unique is that it is based almost entirely on a shared love of calculus. For them, calculus is more than a branch of mathematics; it is a game they love playing together, a constant when all else is in flux. 

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Sync: The Emerging Science of Spontaneous Order

The tendency to synchronize may be the most mysterious and pervasive drive in all of nature. It has intrigued some of the most brilliant minds of the 20th century, including Albert Einstein, Richard Feynman, Norbert Wiener, Brian Josephson, and Arthur Winfree.

At once elegant and riveting, Sync tells the story of the dawn of a new science. Steven Strogatz, a leading mathematician in the fields of chaos and complexity theory, explains how enormous systems can synchronize themselves, from the electrons in a superconductor to the pacemaker cells in our hearts. He shows that although these phenomena might seem unrelated on the surface, at a deeper level there is a connection, forged by the unifying power of mathematics.

* Translated into German, Italian, Korean, Japanese, and Chinese

* Featured on Amazon's list of Customers' Favorites in science for 2003

* Selected as a Best Book of the Year by Discover magazine in 2003

* Won the Anomalist Award for the best science book of 2003

* The Korean edition was named “Best Science Book of 2005” by the Ministry of Science & Technology Korea, and received the “Best Science Book Award” given by the Asia Pacific Center for Theoretical Physics.



  • The most exciting new book of the spring . . . Masterful . . . A gem.”
    — Popular Science
  • A vivid, first-hand account of what it is like to be at the beginning of a scientific revolution.
  • Strogatz has just written a book arguing that the universe is an orderly place marked by harmony and cooperation. In an era of war, terror, and chaos, his viewpoint sounds a bit curious. But if Sync is, well, out of sync with global news, it’s certainly in tune with the scientific world.
  • Strogatz . . . is a first-rate storyteller and an even better teacher . . . Sync is a great read.
  • Every now and then you come across a science book that’s just fun and amazing to read.
    Leader-Post (Regina)
  • Strogatz is a gifted and inspiring communicator whose book, Sync, offers a real sense of what it’s like to be at the beginning of Something Big.
    New Scientist
  • Sync is a wonderfully lucid and thoroughly entertaining story of the emerging science of synchrony. Steven Strogatz, a leading researcher and renowned teacher, takes the reader on a thrilling ride.
    Brian Greene, author of The Elegant Universe, Professor of Physics and Mathematics, Columbia University