Charles49 said:
Inside the interval $$(0, 1)$$ does the function
$$
\frac{-\zeta(s)}{s}
$$
tend to zero uniformly as $$\Im(s)$$ increases?
For complex \,\,s\,,\,\,Re(s)>0\,,\,\,s\neq 1\,\, , we have the analytic cont. of the zeta function \zeta(s)=\frac{\eta(s)}{1-2^{1-s}}\,\,,\,\,\eta(s):=\sum_{n=1}^\infty\frac{(-1)^{n-1}}{n^s}\Longrightarrow -\frac{\zeta(s)}{s}=\frac{\eta(s)}{s(2^{1-s}-1)}
Now, \,\,|2^{1-s}|=\left|e^{(1-s)Log(2)}\right|=e^{(1-Re(s))Log(2)}=2^{(1-Re(s))}\,\,\left|\eta(s)\right|\leq\sum_{n=1}^\infty\frac{1}{n^{Re(s)}} so we have that \left|-\frac{\zeta(s)}{s}\right|\leq\frac{1}{|s|(2^{1-Re(s)}-1)}\sum_{n=1}^\infty\frac{1}{n^{Re(s)}}
As \,\,0< Re(s)< 1\,\, , the above series is divergent for any constant value of s, but the value
\,\,|s|\,\, in the denominator diverges to infinity as well, so it is a matter of comparison between both divergent factors
in that fraction...
I guess you also must be aware of the fact that \,\,-\frac{\zeta(s)}{s}=\int_0^\infty\left\{\frac{1}{t}\right\}t^{s-1}dt\,\, precisely for \,\,0<Re(s)<1\,\, , so perhaps it'd be easier (?) to evaluate the limit according to this integral since as the imaginary
part of s increases to infinity the module of that power in the integral remains constant...
DonAntonio