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Jordi @JordiGH

You know that trick they teach you to evaluate

\[
\int_{-\infty}^\infty e^{-x^2} dx
\]

Multiply it by itself and change to polar coordinates?

Turns out there's a theorem that this trick doesn't generalise at all! It works for this integral and this integral only! (Modulo some trivial multiplicative constants.)

cs.stmarys.ca/%7Edawson/Poisso

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