Quasiextremals for a Radon-like transform

Details Quasiextremals for a Radon-like transform Quasiextremals for a Radon-like transform

2011-06-03

arxiv.org/abs/1106.0722v1

Mathematics

Classical Analysis and ODEs

Scientific paper

Convolution with an appropriate surface measure on a paraboloid is known to define a bounded operator T from L^p(R^d) to L^q(R^d) for certain exponents p,q. By a quasiextremal for the associated inequality, we mean a function f for which the norm of Tf is at least a constant c times the norm of f. Our main result characterizes all quasiextremals, with some quantitative control in terms of c. Several related results are also discussed. This is the first in a series of at least four articles about a circle of questions concerning the inverse problem of deducing information about f from information about the ratio of the norm of Tf to the norm of f.

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