Geodesic
Explicit solution of a Dirichlet problem in nonconvex angle
Contemporary Mathematics. Fundamental Directions, Differential and functional differential equations, Tome 68 (2022) no. 4, pp. 653-670

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In the present work, we give an explicit solution of the Dirichlet boundary-value problem for the Helmholtz equation in a nonconvex angle with periodic boundary data. We present uniqueness and existence theorems in an appropriate functional class and we give an explicit formula for the solution in the form of the Sommerfeld integral. The method of complex characteristics [14] is used.
Keywords: Helmholtz equation, nonconvex angle, Sommerfeld integral, method of complex characteristics. 
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     author = {A. Merzon and P. Zhevandrov and J. E. De la Paz M\'endez and M. I. Romero Rodr{\'\i}guez},
     title = {Explicit solution of a {Dirichlet} problem in nonconvex angle},
     journal = {Contemporary Mathematics. Fundamental Directions},
     pages = {653--670},
     publisher = {mathdoc},
     volume = {68},
     number = {4},
     year = {2022},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMFD_2022_68_4_a6/}
}
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A. Merzon; P. Zhevandrov; J. E. De la Paz Méndez; M. I. Romero Rodríguez. Explicit solution of a Dirichlet problem in nonconvex angle. Contemporary Mathematics. Fundamental Directions, Differential and functional differential equations, Tome 68 (2022) no. 4, pp. 653-670. http://geodesic.mathdoc.fr/item/CMFD_2022_68_4_a6/