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 Mat. Zametki: Year: Volume: Issue: Page: Find

 From the editors 381 Application of number theory in mathematical statisticsYu. V. Linnik 383 Necessary condition for the regularity of branching processesB. A. Sevast'yanov 389 Fourier coefficients of functions of class $\mathrm{Lip} \alpha$ with respect to complete orthonormalized systemsS. V. Bochkarev 397 On the set of sums of a functional seriesE. M. Nikishin 403 Some extremal properties of positive trigonometric polynomialsS. B. Stechkin 411 Linear method for the approximation of differentiable functionsYu. N. Subbotin 423 On series with respect to a Schauder systemP. L. Ul'yanov 431 On the maximal dual pairs of invariant subspaces of $J$-self-adjoint operatorsH. Langer 443 Almost-geodesic mappings of affinely-connected spaces and $e$-structuresN. S. Sinyukov 449 Direct limits of semi-simple ringsKhr. Jensen, L. A. Skornyakov 461 Problem in the theory of cubic residuesI. V. Reshetukha 469 Generalization of the additive problem of divisorsL. I. Ufimtseva 477 Regularization of Ritz method on an example of polynomial approximationN. S. Bakhvalov, M. Shtrekho 483 Spectrum of an elliptic equationA. G. Aslanyan, V. B. Lidskii 495 Theory of characteristic Lyapunov indicesV. M. Millionshchikov 503 Reports presented at the General Session of the Mathematics Section of the Academy of Sciences of the USSR Properties of spectra of nonnegative self-adjoint extensions of elliptic operators and exact conditions for the convergence and Riesz summability of Fourier series of various classes of functionsV. A. Il'in 515