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Les p -topologies en théorie du potentiel

Michèle Mastrangelo, Danièle Dehen (1981)

Annales de l'institut Fourier

La topologie fine a été introduite pour fournir un cadre intrinsèque à la théorie du potentiel. Cependant les ouverts fins ne possèdent pas certaines propriétés dont celle de Lindeberg. Cette considération nous conduit à introduire des topologies moins finies appelées p -topologies ( p R + * ). Nous démontrons pour ces p -topologies un critère analogue à celui établi par N. Wiener, pour les ouverts fins. Puis nous nous intéressons à la théorie des équations différentielles stochastiques sur les p -ouverts.

Local admissible convergence of harmonic functions on non-homogeneous trees

Massimo A. Picardello (2010)

Colloquium Mathematicae

We prove admissible convergence to the boundary of functions that are harmonic on a subset of a non-homogeneous tree equipped with a transition operator that satisfies uniform bounds suitable for transience. The approach is based on a discrete Green formula, suitable estimates for the Green and Poisson kernel and an analogue of the Lusin area function.

Logarithmic capacity is not subadditive – a fine topology approach

Pavel Pyrih (1992)

Commentationes Mathematicae Universitatis Carolinae

In Landkof’s monograph [8, p. 213] it is asserted that logarithmic capacity is strongly subadditive, and therefore that it is a Choquet capacity. An example demonstrating that logarithmic capacity is not even subadditive can be found e.gi̇n [6, Example 7.20], see also [3, p. 803]. In this paper we will show this fact with the help of the fine topology in potential theory.

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