On the Problem of Plateau / Subharmonic Functions: 2 (Ergebnisse der Mathematik und Ihrer Grenzgebiete. 1. Folge, 2)

Rado, T.

ISBN 10: 3540054790 / ISBN 13: 9783540054795

Editore: Springer, 1971

Riguardo questo articolo

Most items will be dispatched the same or the next working day. A copy that has been read but remains in clean condition. All of the pages are intact and the cover is intact and the spine may show signs of wear. The book may have minor markings which are not specifically mentioned. Ex library copy with usual stamps & stickers.

Codice articolo rev3139898174

Dati bibliografici

• Titolo: On the Problem of Plateau / Subharmonic Functions: 2 (Ergebnisse der Mathematik und Ihrer Grenzgebiete. 1. Folge, 2)
• Editore: Springer
• Data di pubblicazione: 1971
• Lingua: Inglese
• ISBN 10: 3540054790
• ISBN 13: 9783540054795
• Rilegatura: Rilegato
• Condizione: Good
• Peso: 349,3 grammi

Descrizione articolo

Riassunto

A convex function f may be called sublinear in the following sense; if a linear function l is ::=: j at the boundary points of an interval, then l:> j in the interior of that interval also. If we replace the terms interval and linear junction by the terms domain and harmonic function, we obtain a statement which expresses the characteristic property of subharmonic functions of two or more variables. This ge­ neralization, formulated and developed by F. RIEsz, immediately at­ tracted the attention of many mathematicians, both on account of its intrinsic interest and on account of the wide range of its applications. If f (z) is an analytic function of the complex variable z = x + i y. then If (z) I is subharmonic. The potential of a negative mass-distribu­ tion is subharmonic. In differential geometry, surfaces of negative curvature and minimal surfaces can be characterized in terms of sub­ harmonic functions. The idea of a subharmonic function leads to significant applications and interpretations in the fields just referred to, and· conversely, every one of these fields is an apparently in­ exhaustible source of new theorems on subharmonic functions, either by analogy or by direct implication.

Contenuti

I. Curves and surfaces.- II. Minimal surfaces in the small.- III Minimal surfaces in the large.- IV. The non-parametric problem.- V. The problem of Plateau in the parametric form.- VI. The simultaneous problem in the parametric form. Generalizations.- I. Definition and preliminary discussion.- II. Integral means.- III. Criterions and constructions.- IV. Examples.- V. Harmonic majorants.- VI. Representation in terms of potentials.- VII. Analogies between harmonic and subharmonic functions.- References.