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 Uspekhi Mat. Nauk: Year: Volume: Issue: Page: Find

 Some questions in the theory of rings close to associativeA. I. Shirshov 3 Rectangular matrices and non-euclidean geometriesB. A. Rozenfel'd 21 A remark on the transmission capacity of a stationary channel with finite memoryI. P. Tsaregradskii 49 Scientific notes and problems Remark on a paper of Davenport and HeilbronnG. Babaev 63 A theorem of Liouville typeM. B. Balk 65 Estimation of the remainder term in formulas of numerical differentiationM. L. Brodskii 73 Dyadicity of the group space of bicompact commutative groupsN. Ya. Vilenkin 79 The connection between metric dimension and harmonic capacityV. D. Erokhin 81 Circumscribed and inscribed ellipsoids of extremal volumeV. L. Zaguskin 89 Linear dimension of the spaces $L_p$ and $l_q$M. I. Kadets 95 An asymptotic property of positive methods of summation of Fourier series and best approximation to functions of class $Z_2$ by linear positive polynomial operators.P. P. Korovkin 99 Investigation of solutions of the differential equation $\frac{dy}{dx}=\frac{Y(x,y)}{X(x,y)}$, where $Y(x,y)$, $X(x,y)$ are rational polynomials in the real variables $x$, $y$ in the neighborhood of a singular pointN. N. Molchanov 105 The spectrum of the product of unitary matricesA. A. Nudelman, P. A. Shvartsman 111 Summation of double series by the methods of Cesàro and Abel in the restricted senseI. I. Ogievetskii 119 Order of approximation of functions of class $Z$ by certain polynomial operatorsI. M. Petrov 127 Algebraic sets of elements in groups and Lie algebrasB. I. Plotkin 133 On irreducible matrix representations of finite semigroupsI. S. Ponizovskii 139 The region of convergence of a power series representing the solution of a differential equationI. T. Reznikovskii 145 Stationary measures in a space of sequencesL. V. Seregin 151 Error estimate of the solution of a system of partial differential equations by the method of finite differencesB. S. Skvortsov 155 Construction of the principal part of the Green function for a second-order elliptic operatorM. G. Slobodyanskii 161 Generalization of a theorem of HausdorffA. F. Solov'ev 167 Uniqueness of a maximal $K$-expansionA. S. Solodovnikov 173 Geodesic arcs on Riemann manifoldsA. S. Schwarz 181 Spectral functions of a differential operatorA. V. Strauss 185 Graphical solution of differential equations with leading argument for various types of initial conditionA. B. Shtykan 193 Lebesgue functions for expansions in series of Jacobi polynomials for the cases $\alpha=\beta=\frac12$, $\alpha=\beta=-\frac12$, $\alpha=\frac12$, $\beta=-\frac12$B. M. Yakhnin 207 Mathematical Events in the USSR Aleksei Ivanovich Markushevich (photo) Aleksei Ivanovich Markushevich (on his fiftieth birthday)A. O. Gel'fond, A. F. Leont'ev, B. V. Shabat 213 Viktor Vladimirovich Vagner (photo) Viktor Vladimirovich Vagner (on his fiftieth birthday)A. E. Liber, Yu. E. Penzov, P. K. Rashevskii 221 Meetings of the Town's Mathematical Seminar in Leningrad (Mathematical Section of Leningrad Scientists House) 229 Reviews and Bibliography I. I. Gol'dman, V. D. Krivchenkov, Problems in quantum mechanics (review)V. P. Maslov, A. A. Samarskii, S. V. Fomin, Yu. M. Shirokov 235 Letters to the Editor CorrectionS. V. Fomin 238