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 Ordinary Differential Equations On the stability of invariant setsN. G. Bulgakov 187 On the multiple completeness of eigenfunctions of a type of ordinary differential pencilA. I. Vahabov 194 The comparison method in systems analysis. IIIS. N. Vassilyev 197 Some questions of the theory of the stability of Lyapunov indices of linear Hamiltonian systemsV. V. Veremenyuk 205 On the stability of solutions of a class of Hamiltonian systems with small changes of the function $H$N. I. Gavrilov 219 On the structure of a region of controllabilityA. M. Zverkin, V. N. Rozova 234 On a boundary value problem for a functional-differential equationM. Martinovič 239 The oscillatory nature of solutions of differential equations with deviating argumentM. I. Tramov 245 Partial Differential Equations On some multidimensional analogues of Darboux problems for the wave equationS. A. Aldashev 254 The Dirichlet problem for a class of elliptic equations with degeneration inside the domainS. K. Afyan 260 Criterion for the strong solvability of the Tricomi problem for the Lavrent'ev–Bitsadze equation in $L_p$ spacesA. B. Bazarbekov, T. Sh. Kal'menov 268 A boundary value problem with A. M. Nakhushev's nonlocal condition for a pseudoparabolic equation of moisture transferV. A. Vogahova 280 On a modified formulation of the Goursat problem for a second-order quasilinear degenerate hyperbolic equationD. K. Gvazava 285 On a necessary condition for the uniform stabilization of the solution of the Cauchy problem for the heat equationV. N. Denisov 290 On some qualitative properties of solutions of second-order equations of parabolic type with continuous coefficientsA. I. Ibragimov 306 A modified Dirichlet problem for equations and systems that are degenerate on the boundaryV. M. Ivakin 319 On boundary value problems for equations of mixed type of the second kind with a nonsmooth line of degeneracyS. S. Isamuhamedov, Zh. Oramov 324 Some constructive properties of solutions of a hyperbolic equation that is degenerate inside the domainPh. B. Nakhusheva 334 Short Communications The Sturm-Liouville problem for a second-order differential equation with fractional derivatives in the lower termsT. S. Aleroev 341 On a boundary value problem for a model equation of mixed typeS. K. Kulazhanov 343 Regularized traces of the Sturm–Liouville operator on the semiaxis in the case of an infinitely diminishing potentialV. A. Lyubishkin 345 Boundary problems for a system of second-order equations of composite typeM. Nurubloev 347 On a degenerate system of composite typeL. S. Sergienko 349 On a four-dimensional not strongly elliptic systemT. V. Treneva 351 Multifrequency systems that have lagM. M. Khapaev, I. V. Kuznetsova 354 On a class of $B$-spaces and its application to the theory of singular integral operatorsV. O. Yandarov 356 People of Soviet science Aleksandr Nikolaevich Filatov (on the occasion of his fiftieth birthday)A. A. Il'yushin, M. Imanaliev, N. M. Matveev, Yu. A. Mitropol'skii 360