Differentsial'nye Uravneniya
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 Ordinary Differential Equations The structure of the solutions of a two-dimensional periodic differential system. IIÈ. I. Grudo, L. A. Poplavskaya 395 Quasicanonical integralsM. V. Dolov 411 Sufficient conditions for complete controllability of nonautonomous systemsG. K. Zakharov, M. M. Senyavin 423 Baire classes of functions and Lyapunov exponents. IVV. M. Millionshchikov 431 Structure of the sequence function in the neighborhood of a separatrix cycle during perturbation of an analytic autonomous system on the planeL. A. Cherkas 469 Partial Differential Equations Inequalities for differential operators from algebraic polynomials on the sphereG. V. Zhidkov 479 Continuous solutions of quasilinear hyperbolic systems with two independent variablesA. D. Myshkis, A. M. Filimonov 488 Some problems of optimal control for a nonlinear control system described by an oscillation equationA. S. Sokhin 501 Numerical methods Convergence of the method of summary approximation for a system of Vlasov equationsS. V. Bogomolov 510 A modification of the Ritz method for variational equations and its applications to boundary value problems with mixed boundary conditionsV. G. Litvinov 519 Difference schemes of any order of accuracy for second-order differential equations on the half-axisV. L. Makarov, S. G. Gocheva 527 Perturbed iteration methods for determining $L$ generalized solutions of nonlinear operator equationsV. I. Meleshko 541 Short Communications Asymptotic behavior of solutions of equations with deviating argument in Hilbert spaceR. G. Aliev 558 The Cauchy system for nonlinear problems with two boundary conditionsE. A. Zagustina, R. È. Kalaba 562 The Riemann method for degenerating quasilinear hyperbolic equations of second orderN. P. Kulikov 566 Estimate of error of linearization of a nonlinear differential system in the critical caseV. N. Shchennikov 568