New Wallis- and Catalan-Type Infinite Products for $π, e$, and $\sqrt{2+\sqrt2}$

Details New Wallis- and Catalan-Type Infinite Products for $π, e$, and $\sqrt{2+\sqrt2}$ New Wallis- and Catalan-Type Infinite Products for $π, e$, and $\sqrt{2+\sqrt2}$

2010-05-15

arxiv.org/abs/1005.2712v1

Amer. Math. Monthly 117 (2010) 912-917

Mathematics

Number Theory

7 pages, accepted by Amer. Math. Monthly

Scientific paper

We generalize Wallis's 1655 infinite product for $\pi/2$ to one for $(\pi/K)\csc(\pi/K)$, as well as give new Wallis-type products for $\pi/4, 2, \sqrt{2+\sqrt2}, 2\pi/3\sqrt3,$ and other constants. The proofs use a classical infinite product formula involving the gamma function. We also extend Catalan's 1873 infinite product of radicals for $e$ to Catalan-type products for $e/4,\sqrt{e}$, and $e^{3/2}/2$. Here the proofs use Stirling's formula. Finally, we find an analog for $e^{2/3}/\sqrt3$ of Pippenger's 1980 infinite product for $e/2$, and we conjecture that they can be generalized to a product for a power of $e^{1/K}$.

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