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The Calculus of Friendship by Steven Strogatz

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Shifts (1980-89)

Once I committed to pursuing math, life took me on a straight trajectory for the next nine years. These were the years of training. During that time Mr. Joffray and I seldom wrote to each other. There are just three items in the green Pendaflex folder from that period. But a few shifts were already starting to take place. In a letter dated December 16, 1980, I thanked Mr. Joffray for the first time:

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So till we meet again, be well and continue your great work—did I ever thank you for your encouragement? Well, I do so now—it was ...

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