Resumen de Wolff's inequality for hypersurfaces

Malabika Pramanik, Izabella Laba

• We extend Wol ¿s ¿local smoothing¿ inequality [19] to a wider class of not necessarily conical hypersurfaces of codimension 1. This class includes surfaces with nonvanishing curvature, as well as certain surfaces with more than one flat direction. An immediate consequence is the Lp-boundedness of the corresponding Fourier multiplier operators.