Tuesday, October 3, 2017

Does Ramanujan summation evaluate the series sumfrac1ns to zeta(s) or zeta(s)frac1s1?

On Wikipedia, in the article on Ramanujan summation as well as some related articles, examples of Ramanujan summation of the form 1ns are done for various values of s which seem to imply that Ramanujan summation yields ζ(s).



However other sources such as this longer pedagogical paper on Ramanujan summation, Ramanujan summation of divergent series (PDF) by B Candelpergher, it says for example on page xii in the intro, or equation 1.22 on page 19, and again on page 59, that




R1nz=ζ(z)1z1.



This shorter summary on Ramanujan summation also contains the same formula at the end.



So which is it?



Does




R1ns=ζ(s)1s1.



or is it just



R1ns=ζ(s)




instead?



Are there two different conventions for Ramanujan summation? If so, can someone elucidate their definitions and differences?

No comments:

Post a Comment

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...