Mathematics – Complex Variables
Scientific paper
2009-04-23
Mathematics
Complex Variables
LaTeX, 17 pages with 7 figures
Scientific paper
We study conformal mappings from the unit disk to circular-arc quadrilaterals with four right angles. The problem is reduced to a Sturm-Liouville boundary value problem on a real interval, with a nonlinear boundary condition, in which the coefficient functions contain the accessory parameters t,lambda of the mapping problem. The parameter lambda is designed in such a way that for fixed t, it plays the role of an eigenvalue of the Sturm-Liouville problem. Further, for each t a particular solution (an elliptic integral) is known a priori, as well as its corresponding spectral parameter lambda. This leads to insight into the dependence of the image quadrilateral on the parameters, and permits application of a recently developed spectral parameter power series (SPPS) method for numerical solution. Rate of convergence, accuracy, and computational complexity are presented for the resulting numerical procedure, which in simplicity and efficiency compares favorably with previously known methods for this type of problem.
Kravchenko Vladislav V.
Porter Michael R.
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