Does anyone know how Euler in the 18th century proved that $$\sum_{n=1}^{\infty} \frac{H_n}{n^2}=2 \zeta(3)$$with $H_n$ being the $n$'th harmonic number?
I have injection $f \colon A \rightarrow B$ and I want to get bijection. Can I just resting codomain to $f(A)$? I know that every function i...
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