Shiver in ecstasy. Yet another exotic formula from Srinivasa Ramanujan (1887-1920), the Indian mathematical genius. http://bit.ly/2sYlB3o pic.twitter.com/RuGZnfzxPt
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These feel a lot less mysterious after reading https://www.sciencedirect.com/science/article/pii/S0022247X03009090?via%3Dihub … and/or https://www.springer.com/us/book/9783319561714 … It's mostly, I think, the being half-integral weight modular forms and their transformation law which does it.