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arxiv: 0709.2181 · v2 · pith:4VUBTDTKnew · submitted 2007-09-13 · 🧮 math.NT · math.PR

A probabilistic proof of Wallis's formula for pi

classification 🧮 math.NT math.PR
keywords formulaproofwallisconstantselementaryfunctionfunctionsgamma
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Using mostly elementary results and functions from probability, we prove Wallis's formula for pi: pi/2 = prod_n (2n * 2n) / ((2n-1) * (2n+1)). The proof involves normalization constants and the Gamma function, Standard normal, and the Student t-Distribution.

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