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A method for the reduction of differential problems to integral equations. (Russian) Zbl 0706.65114
Summary: Given a differential problem in an arbitrary region. It is suggested to solve a different problem instead with the same differential operator but in a canonical region. Its solution can be written down easily or at least simply be formulated in terms of a function that is unknown on the surface of the canonical region. Boundary conditions of the initial problem are exploited to derive this unknown function and this results in an integral equation. Several typical problems of mathematical physics serve as an example.

##### MSC:
 65N35 Spectral, collocation and related methods for boundary value problems involving PDEs 65R20 Numerical methods for integral equations 35J05 Laplace operator, Helmholtz equation (reduced wave equation), Poisson equation 35C15 Integral representations of solutions to PDEs 45E10 Integral equations of the convolution type (Abel, Picard, Toeplitz and Wiener-Hopf type)