Feynman’s trick and Leibniz rule (student stuff)

16 March, 2017 at 15:52 | Posted in Economics | Comments Off on Feynman’s trick and Leibniz rule (student stuff)

In his autobiography Surely you’re joking, Mr. Feynman, Richard Feynman among other things discussed his box of tools, and mentioned a wonderful little tool  by which he was able to differentiate under the integral sign more easily than by the methods usually taught at our universities:

The more standard procedure is well described here:

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