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
R∑1nz=ζ(z)−1z−1.
This shorter summary on Ramanujan summation also contains the same formula at the end.
So which is it?
Does
R∑1ns=ζ(s)−1s−1.
or is it just
R∑1ns=ζ(s)
instead?
Are there two different conventions for Ramanujan summation? If so, can someone elucidate their definitions and differences?
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