Compactness properties of weighted summation operators on trees - the critical case

Details Compactness properties of weighted summation operators on trees - the critical case Compactness properties of weighted summation operators on trees - the critical case

2010-09-13

arxiv.org/abs/1009.2339v1

Mathematics

Functional Analysis

Scientific paper

The aim of this paper is to provide upper bounds for the entropy numbers of summation operators on trees in a critical case. In a recent paper [10] we elaborated a framework of weighted summation operators on general trees where we related the entropy of the operator with those of the underlying tree equipped with an appropriate metric. However, the results were left incomplete in a critical case of the entropy behavior, because this case requires much more involved techniques. In the present article we fill the gap left open in [10]. To this end we develop a method, working in the context of general trees and general weighted summation operators, which was recently proposed in [9] for a particular critical operator on the binary tree. Those problems appeared in natural way during the study of compactness properties of certain Volterra integral operators in a critical case.

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