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Found 81 Documents (Results 1–81)

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A nonlinear analog of the WKB method and the method of the averaged Lagrangian. (English. Russian original) Zbl 0549.35105

J. Sov. Math. 24, 367-372 (1984); translation from Zap. Nauchn. Semin. Leningr. Otd. Mat. Inst. Steklova 117, 162-171 (1981).
MSC:  35Q99 35B25
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Perturbation of the poles of the scattering matrix under variation of the boundary conditions. (English. Russian original) Zbl 0544.47007

J. Sov. Math. 24, 380-386 (1984); translation from Zap. Nauchn. Semin. Leningr. Otd. Mat. Inst. Steklova 117, 183-191 (1981).
Reviewer: C.A.Stuart
MSC:  47A40 35P25
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Discreteness of the eigenfrequencies of scattering by a periodic lattice. (English. Russian original) Zbl 0538.35060

J. Sov. Math. 24, 386-389 (1984); translation from Zap. Nauchn. Semin. Leningr. Otd. Mat. Inst. Steklova 117, 192-197 (1981).
Reviewer: Ya.A.Rojtberg
MSC:  35P25 35J05
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