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Contents
• To jubilee Vasilii Mikhailovich Babich ....... 5
• Belishev M. I., Vakulenko A. F. On stability of triangular factorization of positive operators ....... 7
• Belishev M. I., Simonov S. A. Abstract dynamical system with boundary control. IV ....... 16
• Budyka V., Pokrovskii I. On the deficiency indices of matrix Schr\"{o}dinger operators with point interactions and some classes of perturbed block Jacobi matrices ....... 30
• Budylin A. M., Levin C. B., Toropov V. O. On the scattering problem of three one-dimensional short-range quantum particles in the presence of bound states in pair subsystems ....... 51
• Demchenko M. N. On a certain representation of a solution to the characteristic problem for the ultrahyperbolic equation ....... 76
• Granovskii Ya. I., Malamud M. M. On the absolute continuity of the spectrum of Sturm--Liouville operator with matrix singular coefficients ....... 89
• Korikov D. V. Optimal stability estimates for determination of a non-orientable surface with boundary via its DN-map ....... 102
• Lyalinov M. A., Matveenko~E. E. Discrete spectrum and eigenfunctions of the Schr\"odinger operator on the plane with a singular $\delta$-potential of special form ....... 115
• Mikhaylov A. S., Mikhaylov V. S. On the Weyl function for complex Jacobi matrices ....... 131
• Sergeev V. A. Adiabatic evolution generated by the Schr\"odinger opera\-tor with continuous spectrum. II ....... 145
• Simonov S. A. Smoothness of solutions of the initial-boundary value problem for the matrix telegraph equation on the half-line with a locally summable potential ....... 174
• Slousch V. A., Faddeeva N. M. Operator estimates for homogenization of the two-dimensional Dirac operator with periodic coefficients ....... 197
• Sukhanov V. V. Asymptotic behavior of solutions of a system of the KdV type associated with the Schr\"odinger operator with an energy-depen\-dent potential ....... 219
• Reviews ....... 232

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• Paging 237 pp.

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