Abstract:
A theorem for the sign change of the argument of the Riemann zeta function $S(t)$ in the interval $(t-A,t+A)$ with $A=4,39\ln\ln\ln\ln T$ for each $t,$$T\le t\le T+H$, excluding values from the set $E$ with measure ${\rm mes}(E) =O\left(H(\ln\ln T)^{-1}(\ln\ln\ln T)^{-0,5}\right)$ is proved.
Key words:argument of the Riemann zeta function, Selberg's approximate formula.