Tuesday, March 19, 2019

sequences and series - How to calculate Sn=sumni=1frac1i2

In math lesson, my teacher told me that Euler once used a very delicate method to calculate Sn=ni=11i2 and wrote a paper about it.




I wonder how to calculate this. I need a precise answer, not the answer that it's less than a number such as 2.

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analysis - Injection, making bijection

I have injection f:AB and I want to get bijection. Can I just resting codomain to f(A)? I know that every function i...