Zeros of the extended Selberg class zeta-functions and of their derivatives

Abstract

Levinson and Montgomery proved that the Riemann zeta-function $\zeta (s)$ and its derivative have approximately the same number of non-real zeros left of the critical line. R. Spira showed that ${\zeta }^{\prime }(1/2+it)=0$ implies $\zeta (1/2+it)=0$. Here we obtain that in small areas located to the left of the critical line and near it the functions $\zeta (s)$ and ${\zeta }^{\prime }(s)$ have the same number of zeros. We prove our result for more general zeta-functions from the extended Selberg class $S$. We also consider zero trajectories of a certain family of zeta-functions from $S$.

To appear in Turkish Journal of Mathematics