We show that if log(2 - Delta)f epsilon L-2(R-d), then the inverse Fourier transform of f converges almost everywhere. Here the partial integrals in the Fourier inversion formula come from dilates of a closed bounded neighbourhood of the origin which is star shaped with respect to 0. Our proof is based on a simple application of the Rademacher-Menshov Theorem. In the special case of spherical partial integrals, the theorem was proved by Carbery and Soria. We obtain some partial results when root(log(2 - Delta))f epsilon L-2(R-d) and log log(4 - Delta)f epsilon L-2(R-d). We also consider sequential convergence for general elements of L-2(R-d).
Colzani, L., Meaney, C., Prestini, E. (2006). Almost everywhere convergence of inverse fourier transforms. PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY, 134(6), 1651-1660 [10.1090/S0002-9939-05-08329-2].
Almost everywhere convergence of inverse fourier transforms
PRESTINI, ELENA
2006-01-01
Abstract
We show that if log(2 - Delta)f epsilon L-2(R-d), then the inverse Fourier transform of f converges almost everywhere. Here the partial integrals in the Fourier inversion formula come from dilates of a closed bounded neighbourhood of the origin which is star shaped with respect to 0. Our proof is based on a simple application of the Rademacher-Menshov Theorem. In the special case of spherical partial integrals, the theorem was proved by Carbery and Soria. We obtain some partial results when root(log(2 - Delta))f epsilon L-2(R-d) and log log(4 - Delta)f epsilon L-2(R-d). We also consider sequential convergence for general elements of L-2(R-d).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.