Thursday, 14 January 2016

analytic number theory - Values of the Riemann Zeta function and the Ramanujan Summation - How strong is the connection?

The Ramanujan Summation of some infinite sums is consistent with a couple of sets of values of the Riemann zeta function. We have, for instance, ζ(2n)=n=1n2k=0(R) (for non-negative integer k) and ζ((2n+1))=B2k2k(R) (again, kN). Here, Bk is the k'th Bernoulli number. However, it does not hold when, for example, n=11n=γ(R) (here γ denotes the Euler-Mascheroni Constant) as it is not equal to ζ(1)=.



Question: Are the first two examples I stated the only instances in which the Ramanujan summation of some infinite series coincides with the values of the Riemann zeta function?

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