Geodesic
A method of convolution of Fourier expansions as applied to solving boundary value problems with intersecting interface lines
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 47 (2007) no. 9, pp. 1550-1556 Cet article a éte moissonné depuis la source Math-Net.Ru

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An efficient method of construction of solutions to a set of boundary value problems with additional interface conditions, more complicated boundary conditions, and so on on the basis of known solutions to classical boundary value problems is proposed. The method is based on the representation of solutions to classical and more complicated problems in the form of expansions into Fourier series with subsequent reduction of one series to the other. As a result, formulas directly expressing solutions to more complicated problems in terms of solutions to classical problems are obtained. On the basis of the well-known solution to the Dirichlet problem on a half plane, solutions to boundary value problems with interface conditions (including generalized conditions of the type of a crack and a screen) on intersecting straight lines for boundary conditions of the first and the third kind are obtained. 
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     title = {A~method of convolution of {Fourier} expansions as applied to solving boundary value problems with intersecting interface lines},
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S. E. Kholodovskii. A method of convolution of Fourier expansions as applied to solving boundary value problems with intersecting interface lines. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 47 (2007) no. 9, pp. 1550-1556. http://geodesic.mathdoc.fr/item/ZVMMF_2007_47_9_a9/

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