Revista Matemática Iberoamericana

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Volume 14, Issue 2, 1998, pp. 369–479
DOI: 10.4171/RMI/242

Unrectictifiable 1-sets have vanishing analytic capacity

Guy David[1]

(1) Equipe d'Analyse Harmoniques, Université Paris-Sud, Bât. 425, 91405, Orsay CEDEX, France

We complete the proof of a conjecture of Vitushkin that says that if $E$ is a compact set in the complex plane with fi nite 1-dimensional Hausdorff measure, then $E$ has vanishing analytic capacity (i.e., all bounded analytic functions on the complement of $E$ are constant) if and only if $E$ is purely unrectifi able (i.e., the intersection of $E$ with any curve of fi nite length has zero 1-dimensional Hausdorff measure). As in a previous paper with P. Mattila, the proof relies on a rectifi ability criterion using Menger curvature and an extension of a construction of M. Christ. The main new part is a generalization of the $T(b)$-Theorem to some spaces that are not necessarily of homogeneous type .

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David Guy: Unrectictifiable 1-sets have vanishing analytic capacity. Rev. Mat. Iberoamericana 14 (1998), 369-479. doi: 10.4171/RMI/242