Trigonometric approximation and a general form of the Erdős Turán inequality

Details Trigonometric approximation and a general form of the Erdős Turán inequality Trigonometric approximation and a general form of the Erdős Turán inequality

2010-01-06

arxiv.org/abs/1001.0948v1

Mathematics

Number Theory

Scientific paper

There exists a positive function $\psi(t)${on}$t\geq0${, with fast decay at infinity, such that for every measurable set}$\Omega${in the Euclidean space and}$R>0${, there exist entire functions}$A(x) ${and}$B(x) ${of exponential type}$R${, satisfying\}$A(x)\leq \chi_{\Omega}(x)\leq B(x)${and}$| B(x)-A(x)| \leqslant\psi(R\operatorname*{dist}(x,\partial\Omega)) $. This leads to Erd\H{o}s Tur\'{a}n estimates for discrepancy of point set distributions in the multi dimensional torus. Analogous results hold for approximations by eigenfunctions of differential operators and discrepancy on compact manifolds.

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