I'm interesting to know something about convergence of series related to the Euler totient functin, then my question here is :
Question
Is this a convergent sum :∑∞ϕ(n)=11ϕ(n) ?
Note: ϕ is Euler totient function
I have injection f:A→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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