Titlebook: Geometric Aspects of Harmonic Analysis; Paolo Ciatti,Alessio Martini Conference proceedings 2021 The Editor(s) (if applicable) and The Aut

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,On Young’s Convolution Inequality for Heisenberg Groups,ions attain exact equality. We characterize ordered pairs of functions that nearly achieve equality for Heisenberg groups. The analysis relies on a characterization of approximate solutions of a certain class of functional equations. A result of this type is developed for a class of such equations.

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Strongly Singular Integrals on Stratified Groups,wn. In the Lie group setting, corresponding .. bounds for oscillating spectral multipliers have been established by several authors but only in the open range of exponents. In this paper we establish the endpoint ..(.) bound when . is a stratified Lie group. More importantly we begin to address whether these estimates are sharp.

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Conference proceedings 2021io Ricci. It presents timely syntheses of several major fields of mathematics as well as original research articles contributed by some of the finest mathematicians working in these areas. The subjects dealt with are topics of current interest in closely interrelated areas of Fourier analysis, singu

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2281-518X lated to geometric analysis and several complex variablesThis volume originated in talks given in Cortona at the conference "Geometric aspects of harmonic analysis" held in honor of the 70th birthday of Fulvio Ricci. It presents timely syntheses of several major fields of mathematics as well as orig