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# So yesterday a friend showed me a function

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So yesterday a friend showed me a function

$$-1/12 =\sum_{i=1}^{∞}$$

Can someone explain how this computes to -1/12?

Guest Feb 14, 2017
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Watch this video about it. It is the best explanation that I have seen. You may or may not understand everything, depending on your mathematical skills:

https://curiosity.com/videos/ramanujan-making-sense-of-123-112-and-co-mathologer/

Guest Feb 14, 2017