Monday, October 24, 2022 - 3:00pm
Abstract: We describe remarkable nonlinear analytic approximation tools in the classical setting of Hardy spaces in the upper half plane, and show how to transfer them to the higher dimensional real setting of harmonic functions in upper half spaces. It is known  that all harmonic functions in higher dimensions are combinations of holomorphic functions on 2 dimensional planes, extended as, constant in normal directions. We derive representation theorems, with corresponding isometries, opening the door for applications in higher dimensions, to the processing of highly oscillatory multidimensional signals.
Authors: Ronald R. Coifman, Jacques Peyrière, Guido Weiss