# Tagged Questions

For questions on Euler products, an expansion of a Dirichlet series into an infinite product indexed by prime numbers.

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### Can't find the error with the following sum involving multiplicative functions

I apologize for this question which might be trivial but I'm stuck with this issue and I'm probably doing some mistake over and over again. Here's the framework. Let $f$ and $h$ be two multiplicative ...
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### Using Eulers equation to find General Solutions

I have the problem $y''+4y = 0$ where $y(0) = 1$ , and $y'(0) = 0$ I have to find a particular solution, making a guess it is in the form $y(x) = e^{rx}$ I have the solution here, but I cannot quite ...
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### Euler product on the critical line

can the Euler product be defined on the critical line $1/2+it$ ?? i mean the Euler product for the Riemann Zeta function $$\zeta(s)= \prod _{n}(1-p^{-s})^{-1}$$ for example from the ...
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