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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. The teacher goes from the prime of his career to retirement, competes in whitewater kayaking at the international level, and loses a son. The student matures from high school math whiz to Ivy League professor, suffers the sudden death of a parent, and blunders into a marriage destined to fail. Yet through it all they take refuge in the haven of calculus--until a day comes when calculus is no longer enough.

Like calculus itself, The Calculus of Friendship is an exploration of change. It's about the transformation that takes place in a student's heart, as he and his teacher reverse roles, as they age, as they are buffeted by life itself. Written by a renowned teacher and communicator of mathematics, The Calculus of Friendship is warm, intimate, and deeply moving. The most inspiring ideas of calculus, differential equations, and chaos theory are explained through metaphors, images, and anecdotes in a way that all readers will find beautiful, and even poignant. Math enthusiasts, from high school students to professionals, will delight in the offbeat problems and lucid explanations in the letters.

For anyone whose life has been changed by a mentor, The Calculus of Friendship will be an unforgettable journey.

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  • We started tracking this book on November 22, 2012.
  • This book was $8.07 when we started tracking it.
  • The price of this book has changed 35 times in the past 4,817 days.
  • The current price of this book is $13.34 last checked 4 hours ago.
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  • This lowest price this book has been offered at in the past six months is $13.17.
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  • The lowest price to date was $5.26 last reached on March 8, 2013.
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  • The highest price to date was $14.53 last reached on November 7, 2025.
  • This book has been $14.53 one time since we started tracking it.

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Additional Info

  • Publication Date: March 7, 2011
  • Text-to-Speech: Disabled
  • Lending: Disabled
  • Print Length: 174 Pages
  • File Size: 40 KB

We last verified the price of this book about 4 hours ago. At that time, the price was $13.34. This price is subject to change. The price displayed on the Amazon.com website at the time of purchase is the price you will pay for this book. Please confirm the price before making any purchases.