On the Problem of Plateau / Subharmonic Functions (Ergebnisse der Mathematik und Ihrer Grenzgebiete): 2 - Rilegato

Rado, T.

 
9783540054795: On the Problem of Plateau / Subharmonic Functions (Ergebnisse der Mathematik und Ihrer Grenzgebiete): 2

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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.

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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.

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Altre edizioni note dello stesso titolo

9783642983078: On the Problem of Plateau: 2

Edizione in evidenza

ISBN 10:  3642983073 ISBN 13:  9783642983078
Casa editrice: Springer, 1933
Brossura