Maximal functions: Spherical means*
AUTOR(ES)
Stein, Elias M.
RESUMO
Let [unk](f)(x) denote the supremum of the averages of f taken over all (surfaces of) spheres centered at x. Then f → [unk](f) is bounded on Lp(Rn), whenever p > n/(n - 1), and n ≥ 3.
