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The Feynman Essays

Richard Feynman's Integral Trick

Panda the Red
Panda the Red
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Jul 16, 2018 * 7 min read
 
[1]
Richard Feynman lecturing in 1963 (Photo: Caltech Archives)


    "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...

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