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AuthorRadรณ, Tibor. author
TitleOn the Problem of Plateau / Subharmonic Functions [electronic resource] / by Tibor Radรณ
ImprintBerlin, Heidelberg : Springer Berlin Heidelberg : Imprint: Springer, 1971
Connect tohttp://dx.doi.org/10.1007/978-3-642-65236-3
Descript XI, 109 p. online resource

SUMMARY

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 geยญ neralization, formulated and developed by F. RIEsz, immediately atยญ 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-distribuยญ tion is subharmonic. In differential geometry, surfaces of negative curvature and minimal surfaces can be characterized in terms of subยญ harmonic functions. The idea of a subharmonic function leads to significant applications and interpretations in the fields just referred to, andยท conversely, every one of these fields is an apparently inยญ exhaustible source of new theorems on subharmonic functions, either by analogy or by direct implication


CONTENT

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


Mathematics Mathematical analysis Analysis (Mathematics) Mathematics Analysis



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