Nonlinear Sciences – Exactly Solvable and Integrable Systems
Scientific paper
2004-01-30
Nonlinear Sciences
Exactly Solvable and Integrable Systems
11 pages. In: Proceedings of the International Seminar "Day on Diffraction- 2003", St.Petersburg, Russia, June 24-27, 2003, pp
Scientific paper
Two approaches to solution of the two-dimensional Helmholtz equation with a "wave number" are proposed. The results can be applied both in numerical areas of physics and in the theory of nonlinear equations. The first approach is based on the requirement of the covariance of equation under the generalized Darboux transformation (Moutard transformation). It allows to construct a new solution of equation, using a given initial solution of the equation. Simultaneously we obtain the "dressing" relation for the "wave number". The simplest examples of the approach are considered in detail. In the second approach the Green-Cauchy formula (the $\bar \partial$-method) is applied to reduce the solution of the equation to the solution of a system of singular integral equations.
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