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The semiadditivity of continuous analytic capacity and the inner boundary conjecture
- American Journal of Mathematics
- Johns Hopkins University Press
- Volume 126, Number 3, June 2004
- pp. 523-567
- 10.1353/ajm.2004.0021
- Article
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Let α(E) be the continuous analytic capacity of a compact set E ⊂ [inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="01i" /]. In this paper we obtain a characterization of α in terms of curvature of measures with zero linear density, and we deduce that α is countably semiadditive. This result has important consequences for the theory of uniform rational approximation on compact sets. In particular, it implies the so-called inner boundary conjecture.