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 1988, Volume 24, Number 5

 People of Soviet science Vladimir Aleksandrovich Il'in (on the occasion of his 60th birthday)Sh. A. Alimov, A. V. Bitsadze, A. A. Dorodnitsyn, N. P. Erugin, E. I. Moiseev, A. A. Samarskii, A. N. Tikhonov 739 Ordinary Differential Equations Generalizations of Hamiltonian systemsA. S. Galiullin 751 Structure of the solutions of an autonomous Pfaffian system with two pure imaginary roots of the characteristic equationÈ. I. Grudo 760 Conjugate problems of the identification of dynamical systemsYu. V. Zaika, N. E. Kirin 770 Lipschitz $R$-stability of attracting setsO. A. Ivanov, S. Yu. Pilyugin 776 The number of characteristic and lower exponents of an exponentially stable system with higher-order perturbationsN. A. Izobov 784 An a priori estimate for the solution of a problem associated with a nonlocal boundary value problem of the first kindV. A. Il'in, E. I. Moiseev 795 Asymptotic behavior of the solutions of the Lorenz systemG. A. Leonov 804 Conditions for the optimality of the control of points of the trajectories of dynamical systems under incomplete information on the stateA. V. Panteleev 810 Qualitative differential games in a class of $E$-strategiesG. V. Tomskii 818 Partial Differential Equations Some properties of polyharmonic functionsA. V. Bitsadze 825 Local solvability of pseudodifferential equations of constant strength. ISh. Bouzar, A. A. Kuleshov 831 Asymptotic solution of an initial-boundary value problem on the propagation of acoustic waves in a medium with relaxationV. V. Varlamov 838 Solvability of the first boundary value problem for an equation of elliptic type in the unit diskP. T. Dybov 844 An estimate for the difference of the Riesz means of two spectral expansions for a function in the class $L_2$V. A. Il'in 852 A theorem on an oblique derivative for second-order parabolic equations that admit weak degeneration. IIL. I. Kamynin 863 Boundary values and initial values of the solutions of a second-order parabolic equation with discontinuous coefficientsV. M. Mirzoev 875 Short Communications Estimates for the solutions of differential-difference equations with impulse actionS. D. Borisenko 886 An estimate for the domain of exponential stability of the zero solution of a class of nonlinear systemsV. I. Varlamov 888 On some two-dimensional mixed problems with existence of an initial function different from zero for the conditions of conjugation. IIS. I. Gaiduk 890 Construction of the normal form in a neighborhood of a cycle by means of the Krylov–Bogolyubov–Mitropol'skiǐ asymptotic methodA. Yu. Kolesov, Yu. S. Kolesov 891 An integral inequalityG. S. Krechetov 894 Convergence of the Riesz means of spectral expansions that correspond to the one-dimensional Schrödinger operatorA. S. Makin 897 On the theory of the controllability and feasibility of linear stationary differential-difference systemsS. A. Minyuk 899 Asymptotic behavior of the solutions of parabolic equations with coefficients that depend on timeV. D. Repnikov 902 Uniqueness of the solution of the Frankl' problem for equations of mixed typeK. B. Sabitov 904 The integrating factor of the Abel equationA. A. Samodurov 907 Bifurcation of quasiperiodic solutions for a nonanalytic system of differential equationsN. V. Uspenskaya 910 Canonical transformations in Nambu mechanicsA. M. Hwan 912