YouTube02 Apr 2023
24m

Why π is in the normal distribution (beyond integral tricks)

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3Blue1Brown

This podcast delves into the unexpected emergence of pi in the formula for the normal distribution. It kicks off with a fascinating story about someone's disbelief upon encountering the mathematical proof. The discussion then transitions into a classic proof that reveals this connection through an ingenious integration technique that takes the concept into three dimensions. Next, it highlights the derivation of the Gaussian distribution by Herschel and Maxwell, illustrating how its key features—radial symmetry and coordinate independence—naturally result in the function's form and the inclusion of pi. The episode wraps up with a teaser for a future installment that will explore the relationship between this derivation and the central limit theorem.

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