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A Sawyer Duality Principle for Radially Monotone Functions in $R^n$.  
 
  Authors: Sorina Barza, Maria Johansson, Lars-Erik Persson,  
  Keywords: Duality theorems, Radially monotone functions, Weighted inequalities.  
  Date Received: 09/02/05  
  Date Accepted: 14/02/05  
  Subject Codes:

Prim. 26D15, 47B38; Sec. 26B99, 46E30.

  
  Editors: Constantin P. Niculescu,  
 
  Abstract:

Let $ f$ be a non-negative function on $ mathbb{R}^{n}$, which is radially monotone $ left( 0fdownarrow rright) $. For $ 1pinfty $, $ ggeq 0$ and $ v$ a weight function, an equivalent expression for

$displaystyle underset{fdownarrow r}{sup }frac{int_{mathbb{R}^{n}}fg}{left( int_{mathbb{R}^{n}}f^{p}vright) ^{frac{1}{p}}} $

is proved as a generalization of the usual Sawyer duality principle. Some applications involving boundedness of certain integral operators are also given. ;


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