(adsbygoogle = window.adsbygoogle || []).push({}); What is up with people thinking that 1 + 2 + 3 + ... = -1/12????

My friend showed me a Youtube video where a Physicist "proves" that ∑_{kεN}k = -1/12. The guy in the video uses a lot of illegal maneuvers. But apparently this "fact" is used in String Theory. Do Physicists use different definitions of convergence or something? I can easily prove that the sequence {1 + 2 + ... + n} is unbounded using the definitions I learned in Intro to Real Analysis in college.

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# What is up with people thinking that 1 + 2 + 3 + = -1/12?

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