
A generalized principle of localization for the Riesz means of a Fourier series in an arbitrary fundamental system of functions of the Laplace operator with discrete spectrum V. A. Il'in

1143 

A generalized principle of localization for the Riesz means that correspond to an arbitrary selfadjoint nonnegative extension of the Laplace operator V. A. Il'in

1159 

Some tests for the absence or uniqueness of limit cycles L. A. Cherkas, L. I. Zhilevich

1170 

Multidimensional transmission systems of generalized processes. I, II S. T. Zavalishchin

1179 

A certain method of investigating separatrices N. I. Avdonin

1188 

The essential singularities of the solutions of certain systems of differential equations S. G. Kondratenya

1200 

The Stokes multipliers for different systems of differential equations. II V. R. Smilyanskii

1207 

A certain application of qualitative methods in the theory of the stability of nonlinear systems I. V. Gaishun

1211 

Similarity and homeomorphism of a perturbed and an unperturbed system with blocktriangular matrix È. A. Tikhonova

1221 

Stability in a product of spaces I. I. Matveeva

1230 

The stability of linear equations of neutral type V. B. Kolmanovskii

1235 

Differential equations with deviating argument dependent on the derivative of the solution, considered in a Banach space with a cone L. A. Zhivotovskii

1247 

Oscillations of linear systems with autonomous selfregulating lag R. E. Ginzburg

1257 

Asymptotics of the width of lacunae in the spectrum of a Sturm–Liouville operator with periodic analytic potential S. G. Simonyan

1265 

Regularization of equations with a closed linear operator O. A. Liskovets

1273 

An investigation of certain classes of second order quasilinear elliptic equations. II, III A. D. Dzhabrailov

1279 

The principle of limiting amplitude for the Cauchy–Poisson problem. III E. K. Isakova

1289 

Remarks on the Kupradze–Aleksidze method A. B. Bakushinskii

1298 

Estimates of weak solutions in $C_{l+\alpha(r)}$ of systems that are elliptic in the sense of Douglis and Nirenberg M. V. Ivanovich

1302 

Short Communications


The estimation of the domains of nonnegativity of the Cauchy function and its derivatives up to order $n1$ for an $n$th order ordinary linear differential equation N. Z. Gabbasov, E. S. Chichkin

1308 

The stability in the large of the zero solution of certain nonlinear third order differential equations L. I. Burganskaya

1311 

The stability in the large of the zero solution of certain nonlinear fourth order differential equations L. I. Burganskaya

1314 

Formulae for the computation of the index of a singular point of the equation $y'=\frac{P_3(x,y)}{Q_3(x,y)}$ in terms
of the coefficients P. T. Cherevichny

1318 

Partial differential equations with involutions I. Ya. Viner

1320 

Nearly periodic solutions of a system of Volterra equations V. R. Vinokurov

1323 

The approximate solution of nonlinear integrodifference equations by the method of averaging functional corrections M. M. Gal'

1325 

An integral estimate of the derivatives of a harmonic function of an $N$dimensional region in the $L_p$ metric, and some
applications of it A. S. Fokht

1329 