Mixed problem for the Laplace equation outside cuts in a plane with setting Dirichlet and skew derivative conditions on different sides of the cuts

Authors:
P. A. Krutitskii and A. I. Sgibnev

Journal:
Quart. Appl. Math. **64** (2006), 105-136

MSC (2000):
Primary 35J05, 45E05

DOI:
https://doi.org/10.1090/S0033-569X-06-00987-0

Published electronically:
January 24, 2006

MathSciNet review:
2211380

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Abstract: The mixed problem for the Laplace equation outside cuts in a plane is considered. The Dirichlet condition is posed on one side of each cut and the skew derivative condition is posed on the other side. This problem generalizes the mixed Dirichlet-Neumann problem. Integral representation for a solution of the boundary value problem is obtained in the form of potentials. The densities in the potentials satisfy the uniquely solvable Fredholm integral equation of the second kind and index zero. Uniqueness and existence theorems for a solution of the boundary value problem are proved. Singularities of the gradient of the solution of the boundary value problem at the tips of the cuts are studied. Asymptotic formulas for singularities are obtained. The effect of the disappearance of singularities is discussed.

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Additional Information

**P. A. Krutitskii**

Affiliation:
Dept. of Mathematics, Faculty of Physics, Moscow State University, Moscow 117234, Russia

**A. I. Sgibnev**

Affiliation:
Dept. of Mathematics, Faculty of Physics, Moscow State University, Moscow 117234, Russia

Received by editor(s):
March 10, 2005

Published electronically:
January 24, 2006

Additional Notes:
This work was partly supported by the RFBR grant no. 05-01-00050.

Article copyright:
© Copyright 2006
Brown University