On Mar 24, 9:28=A0pm, Vladimir Bondarenko <v...@[EMAIL PROTECTED]
> wrote:
> NSum[(Cos[n]/n)^1, {n, 1, Infinity}] =A0 =A0 slow convergence
> NSum[(Cos[n]/n)^2, {n, 1, Infinity}] =A0 =A0 fast convergence
>
> 0.0420195 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0RIGHT
> 0.572578 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 WRONG
>
> Any comments?
(Well, one could say that, intuitively, it's not quite
clear which of them converges faster... the first series
resembles an alternating one... but the second one, with
strictly positive terms, decays at infinity as ?/n^2 ...
(I hope "?" is not O(n) :))
|
