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 On the variational theory of characteristic values for nonlinear integral equationsM. M. Vainberg 3 On an equation of mixed elliptic-hyperbolic typeM. B. Kapilevich 11 On primitive compositionV. A. Tartakovskii 39 New criteria of stability according to Lyapunov in the case of an infinite triangular matrixI. P. Makarov 53 On a class of curves with curvature of bounded variation on a convex surfaceV. A. Zalgaller 59 The configuration $D_9$L. A. Skornyakov 73 On some questions of the theory of nilpotent and locally nilpotent groups without torsionV. M. Glushkov 79 On a variant of the Waring-Goldbach problemI. I. Pyatetskii-Shapiro 105 Characteristic exponents of systems near to linear onesD. M. Grobman 121 On the extension of continuous functions in topological spacesB. Z. Vulikh 167 A sufficient condition for the existence of a stable limit cycle for an equation of the second orderA. F. Filippov 171 On the number of limit cycles appearing with variation of the coefficients from an equilibrium state of the type of a focus or a centerN. N. Bautin 181 On the theory of noncommutative groups without torsionB. I. Plotkin 197 On the weight of the ring of bounded continuous functions over a normal spaceYu. M. Smirnov 213 Stability of the index of an unbounded operatorM. G. Krein, M. A. Krasnosel'skii 219