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G. Bradistilov 《Mathematische Annalen》1939,116(1):181-203
Ohne ZusammenfassungDiese Arbeit ist von der Philosophischen Fakultät II. Sektion der Universität München als Dissertation (D 19) angenommen worden. Herrn Geheimrat Prof. Dr. O. Perron danke ich herzlich für die wertvollen Anregungen. 相似文献
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Otto Hübner 《Numerische Mathematik》1982,39(2):195-204
Summary Discretization of the Theodorsen integral equation (T) yields the discrete Theodorsen-equation (T
d
), a system of 2N nonlinear equations. A so-called -condition may be fulfilled. It is known that (T) has exactly one continuous solution. This solution gives the boundary correspondence of the normalized conformal map of the unit disc onto a given domainG. It is also known that (T
d
) has one and only one solution if <1 and at least one solution if 1. We show here that for every 1 and N\ {1} there is a domainG satisfying an -condition such that (T
d
) has an infinite number of solutions. Moreover, givenK>0 and any domainG that fulfills an -condition, we will construct a domainG
1 in the neighbourhood ofG that fulfills a max (1, +K)-condition such that (T
d
) forG
1 has an infinite number of solutions. The underlying idea of the construction of those domains allows also to give important new facts about iterative methods for the solution of (T
d
), even in the case <1. 相似文献
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Karlheinz Schüffler 《manuscripta mathematica》1982,40(1):1-15
In the Sobolev space Hm(B,?3), B the open unit disc in ?2, we consider the set Mn of all conformally parametrized surfaces of constant mean curvature H with exactly n simple interior branch points (and no others). We denote by M*n the set of all xεMn with the following properties:
- in every branch point the geometrical condition KG¦xZ¦≡O holds (KG is the Gauss curvature and xz is the complex gradient of the surface x).
- the corresponding boundary value problem Δh+×z{2(2H2-KG)h=O,hδB=O, is uniquely solvable.
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