On Riemann sums and maximal functions in $\ZR^n$

Details On Riemann sums and maximal functions in $\ZR^n$ On Riemann sums and maximal functions in $\ZR^n$

2008-03-31

arxiv.org/abs/0803.4392v1

Mathematics

Classical Analysis and ODEs

27 pages

Scientific paper

In this paper we investigate problems on almost everywhere convergence of subsequences of Riemann sums \md0 R_nf(x)=\frac{1}{n}\sum_{k=0}^{n-1}f\bigg(x+\frac{k}{n}\bigg),\quad x\in \ZT. \emd We establish a relevant connection between Riemann and ordinary maximal functions, which allows to use techniques and results of the theory of differentiations of integrals in $\ZR^n$ in mentioned problems. In particular, we prove that for a definite sequence of infinite dimension $n_k$ Riemann sums $R_{n_k}f(x)$ converge almost everywhere for any $f\in L^p$ with $p>1$.

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