Discrete analogues in harmonic analysis: Spherical averages

Details Discrete analogues in harmonic analysis: Spherical averages Discrete analogues in harmonic analysis: Spherical averages

2004-09-20

arxiv.org/abs/math/0409365v1

Ann. of Math. (2), Vol. 155, (2002), no. 1, 189--208

Mathematics

Classical Analysis and ODEs

20 pages, published version

Scientific paper

In this paper we prove an analogue in the discrete setting of \Bbb Z^d, of the spherical maximal theorem for \Bbb R^d. The methods used are two-fold: the application of certain "sampling" techniques, and ideas arising in the study of the number of representations of an integer as a sum of d squares in particular, the "circle method". The results we obtained are by necessity limited to d \ge 5, and moreover the range of p for the L^p estimates differs from its analogue in \Bbb R^d.

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