Mathematics – Number Theory
Scientific paper
2011-05-09
Acta Math. Hungar. 102 (2004), no. 4, 305--320
Mathematics
Number Theory
Scientific paper
10.1023/B:AMHU.0000024681.23784.
It is known, that under the assumption of the generalized Riemannian hypothesis, the function $\pi(x, q, 1) - \pi(x, q, a)$ has infinitely many sign changes. In this article we give an upper bound for the least such sign change. Similarly, assuming the Riemannian hypothesis we give a lower bound for the number of sign changes of $\pi(x)-\li x$. The implied results for the least sign change are weaker then those obtained by numerical methods, however, our method makes no use of computations of zeros of the $\zeta$-function.
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