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Zbl 1157.45303
Wegmann, Rudolf; Nasser, Mohamed M. S.
The Riemann-Hilbert problem and the generalized Neumann kernel on multiply connected regions. (English)
[J] J. Comput. Appl. Math. 214, No. 1, 36-57 (2008). ISSN 0377-0427

Summary: This paper presents and studies Fredholm integral equations associated with the linear Riemann-Hilbert problems on multiply connected regions with smooth boundary curves. The kernel of these integral equations is the generalized Neumann kernel. The approach is similar to that for simply connected regions [see {\it R. Wegmann, A. H. M. Murid} and {\it M. M. S. Nasser}, J. Comput. Appl. Math. 182, No. 2, 388--415 (2005; Zbl 1070.30017)]. There are, however, several characteristic differences, which are mainly due to the fact that the complement of a multiply connected region has a quite different topological structure. This implies that there is no longer perfect duality between the interior and exterior problems. We investigate the existence and uniqueness of solutions of the integral equations. In particular, we determine the exact number of linearly independent solutions of the integral equations and their adjoints. The latter determine the conditions for solvability. An analytic example on a circular annulus and several numerically calculated examples illustrate the results.

MSC 2000:: *45E10 Integral equations of the convolution type
30E25 Boundary value problems, complex analysis

Keywords: Riemann-Hilbert problems; generalized Neumann kernel; multiply connected regions; Fredholm integral equations

Citations: Zbl 1070.30017

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