Feynman’s trick (student stuff)

26 May, 2020 at 14:59 | Posted in Economics | 1 Comment


I had learned to do integrals by various methods shown in a book that my high
school physics teacher Mr. Bader had given me. [It] showed how to differentiate
parameters under the integral sign – it’s a certain operation. It turns out that’s not taught very much in the universities; they don’t emphasize it. But I caught on how to use that method, and I used that one damn tool again and again. [If] guys at MIT or Princeton had trouble doing a certain integral, [then] I come along and try differentiating under the integral sign, and often it worked. So I got a great reputation for doing integrals, only because my box of tools was different from everybody else’s, and they had tried all their tools on it before giving the problem to me.

Richard Feynman

1 Comment

  1. very nice indeed, brings back memories of the joys and terrors of integral calculus

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