paradox

I have seen this before Majid.  I call it 'math magic'   :)

Maybe Alan can say something more helpful :)  

Do you want the proof or do you just want to know how it can be useful ?

Hello Majid:

                   The best explanation of this great discovery is here:

https://www.youtube.com/watch?v=jcKRGpMiVTw&t=638s

This is called "Euler-Riemann zeta function". Its importance in physics is mainly in the "String Theory", but its treatment is highly advanced mathematics.

You could try reading the textbook String Theory, by Joseph Polchinski of the University of California, Santa Barbara, where the equation appears.  Good luck with that!