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Construction of a certain superharmonic majorant

Paul Koosis (1994)

Annales de l'institut Fourier

Given a function f ( t ) 0 on with - ( f ( t ) / ( 1 + t 2 ) ) d t < and | f ( t ) - f ( t ' ) | l | t - t ' | , a procedure is exhibited for obtaining on a (finite) superharmonic majorant of the function F ( z ) : 1 π - | 𝔍 z | | z - t | 2 f ( t ) d t - A l | 𝔍 z | , where A is a certain (large) absolute constant. This leads to fairly constructive proofs of the two main multiplier theorems of Beurling and Malliavin. The principal tool used is a version of the following lemma going back almost surely to Beurling: suppose that f ( t ) , positive and bounded away from 0 on , is such that - ( f ( t ) / ( 1 + t 2 ) d t < and denote, for any constant α > 0 and each x , the unique...

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