Beurling's criterion and extremal metrics for Fuglede modulus
Abstract
We formulate a necessary and sufficient condition for an admissible metric to be extremal for the Fuglede p-modulus of a system of measures. When p=2, this characterization generalizes Beurling's criterion, a sufficient condition for an admissible metric to be extremal for the extremal length of a planar curve family. In addition, we prove that every non-negative Borel function in Rn with positive and finite p-norm is extremal for the p-modulus of some curve family.
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