There has been a considerable revival of interest in potential theory during the last 20 years. This is made evident by the appearance of new mathematical disciplines in that period which now-a-days are considered as parts of potential theory. Examples of such disciplines are: the theory of Choquet capacities, of Dirichlet spaces, of martingales and Markov processes, of integral representation in convex compact sets as well as the theory of harmonic spaces. All these theories have roots in classical potential theory. The theory of harmonic spaces, sometimes also called axiomatic theory of...

Die Einflihrung der idealen Rander in der Theorie der Riemannschen FIachen solI der Erweiterung der Satze aus der Funktionentheorie auf den Fall der beliebigen Riemannschen Flachen dienen, und zwar jener Satze, die sich auf die relativen Rander der schlicht en Gebiete beziehen, wie z. B. das Dirichletsche Problem, das Poissonsche Integral, die Satze von FATOU-NEVANLINNA, BEURLING, PLESSNER, RIEsz. AuBer dem bieten sie ein wertvolles Untersuchungsmittel - mit einer starken intuitiven Basis - flir verschiedene Probleme der Riemannschen Flachen und ermoglichen eine einfachere und durchsichtigere...

Since about 1915 integration theory has consisted of two separate branches: the abstract theory required by probabilists and the theory, preferred by analysts, that combines integration and topology. As long as the underlying topological space is reasonably nice (e.g., locally compact with countable basis) the abstract theory and the topological theory yield the same results, but for more compli cated spaces the topological theory gives stronger results than those provided by the abstract theory. The possibility of resolving this split fascinated us, and it was one of the reasons for writing...