# 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, Bat 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 finite 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 unrectifiable (i.e., the intersection of $E$ with any curve of finite length has zero 1-dimensional Hausdorff measure). As in a previous paper with P. Mattila, the proof relies on a rectifiability 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 G. Unrectictifiable 1-sets have vanishing analytic capacity. *Rev. Mat. Iberoamericana* 14 (1998), 369-479. doi: 10.4171/RMI/242