Farag, Hany M. (2000) Curvatures of the Melnikov type, Hausdorff dimension, rectifiability, and singular integrals on Rn. Pacific Journal of Mathematics, 196 (2). pp. 317339. ISSN 00308730. http://resolver.caltech.edu/CaltechAUTHORS:FARpjm00

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Abstract
One of the most fundamental steps leading to the solution of the analytic capacity problem ( for 1sets) was the discovery by Melnikov of an identity relating the sum of permutations of products of the Cauchy kernel to the threepoint Menger curvature. We here undertake the study of analogues of this socalled MengerMelnikov curvature, as a nonnegative function defined on certain copies of Rn, in relation to some natural singular integral operators on subsets of Rn of various Hausdorff dimensions. In recent work we proved that the Riesz kernels x\x\(m1) (m is an element of N\ {1}) do not admit identities like that of Melnikov in any Lk norm (k is an element of N). In this paper we extend these investigations in various ways. Mainly, we replace the Euclidean norm \.\ by equivalent metrics delta(., .) and we consider all possible k, m, n, delta(., .). We do this in hopes of finding better algebraic properties which may allow extending the ideas to higher dimensional sets. On the one hand, we show that for m > 1 no such identities are admissible at least when is a norm that is invariant under reflections and permutations of the coordinates. On the other hand, for m = 1, we show that for each choice of metric, one gets an identity and a curvature like those of Melnikov. This allows us to generalize those parts of the recent singular integral and recti ability theories for the Cauchy kernel that depend on curvature to these much more general kernels, and provides a more general framework for the curvature approach.
Item Type:  Article 

Additional Information:  © Copyright 2000 Pacific Journal of Mathematics. Received February 10, 1999 and revised July 1, 1999. 
Subject Keywords:  ANALYTIC CAPACITY, CAUCHY INTEGRALS, EXISTENCE, CURVES, SETS, R(N) 
Issue or Number:  2 
Record Number:  CaltechAUTHORS:FARpjm00 
Persistent URL:  http://resolver.caltech.edu/CaltechAUTHORS:FARpjm00 
Alternative URL:  http://pjm.math.berkeley.edu/2000/1962/p05.html 
Usage Policy:  No commercial reproduction, distribution, display or performance rights in this work are provided. 
ID Code:  709 
Collection:  CaltechAUTHORS 
Deposited By:  Tony Diaz 
Deposited On:  16 Sep 2005 
Last Modified:  26 Dec 2012 08:41 
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