A poster on SE wondered how he could prove the following: $$\sum_{j=2}^\infty \prod_{k=1}^j \frac{2 k}{j+k1} = \pi$$ Well! I never would have thought of this on my own, but I’m not really here to think up stuff like this on my own. Rather, I am here to solve the problems of confused souls, and here […]

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