## The Theory of Hardy's Z-Function by Professor Aleksandar Ivić

By Professor Aleksandar Ivić

Hardy's Z-function, on the topic of the Riemann zeta-function ζ(s), used to be initially utilised by way of G. H. Hardy to teach that ζ(s) has infinitely many zeros of the shape ½+it. it really is now among an important capabilities of analytic quantity idea, and the Riemann speculation, that every one advanced zeros lie at the line ½+it, may be the best identified and most vital open difficulties in arithmetic. this day Hardy's functionality has many functions; between others it truly is used for huge calculations in regards to the zeros of ζ(s). This entire account covers many points of Z(t), together with the distribution of its zeros, Gram issues, moments and Mellin transforms. It positive aspects an in depth bibliography and end-of-chapter notes containing reviews, comments and references. The e-book additionally presents many open difficulties to stimulate readers attracted to extra study.

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E. up to height T for some explicit, large T ) of an L-function lie on the critical line seems at first sight to be strong evidence for the corresponding RH. However, analytic number theory has had many conjectures supported by large amounts of numerical evidence that turn out to be false. , [Iv18]). The problem is that the behavior of a function is often influenced by very slowly increasing functions such as log log T , that tend to infinity, but do it so slowly that this cannot be detected by computation.

47), see K. Soundararajan [Sou4]. He proved that one can take C = 3/8. A sharper result, also on the RH, was obtained by V. Chandee and K. Soundararajan [ChSo], namely |ζ ( 12 + it)| log 2 log t 2 log log t exp 1+O log log log t log log t . 53) as shown by K. Soundararajan [Sou3]. 33) explicit. Namely it was proved by T. S. 17 log T . This is an unconditional result. On the RH, K. Ramachandra and A. 2 log T log log T (T > T0 ). This was improved, √ again on the RH, by D. A. Goldston and S. M. Gonek [GoGo].

It may be conjectured that both S(T ) and S1 (T ) are of the order (log T )1/2+o(1) as T → ∞, although it is known, for example, only that S(T ) = O(log T ) (and O(log T / log log T ) if the RH holds), so that there is still a considerable gap between O- and -results. -M. Tsang [Tsa2] has shown that unconditionally sup log |ζ ( 12 + it)| sup ±S(t) T