Almost everywhere convergence of orthogonal expansions of several variables

Details Almost everywhere convergence of orthogonal expansions of several variables Almost everywhere convergence of orthogonal expansions of several variables

2003-12-31

arxiv.org/abs/math/0312526v1

Mathematics

Classical Analysis and ODEs

23 pages

Scientific paper

For weighted $L^1$ space on the unit sphere of $\RR^{d+1}$, in which the weight functions are invariant under finite reflection groups, a maximal function is introduced and used to prove the almost everywhere convergence of orthogonal expansions in $h$-harmonics. The result applies to various methods of summability, including the de la Vall\'ee Poussin means and the Ces\`aro means. Similar results are also established for weighted orthogonal expansions on the unit ball and on the simplex of $\RR^d$.

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