Differ. Uravn., 1970, Volume 6, Number 7

Differentsial'nye Uravneniya

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1970, Volume 6, Number 7

	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	1143–1158
	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	1159–1169
	Some tests for the absence or uniqueness of limit cycles L. A. Cherkas, L. I. Zhilevich	1170–1178
	Multidimensional transmission systems of generalized processes. I, II S. T. Zavalishchin	1179–1187
	A certain method of investigating separatrices N. I. Avdonin	1188–1199
	The essential singularities of the solutions of certain systems of differential equations S. G. Kondratenya	1200–1206
	The Stokes multipliers for different systems of differential equations. II V. R. Smilyanskii	1207–1210
	A certain application of qualitative methods in the theory of the stability of nonlinear systems I. V. Gaishun	1211–1220
	Similarity and homeomorphism of a perturbed and an unperturbed system with block-triangular matrix È. A. Tikhonova	1221–1229
	Stability in a product of spaces I. I. Matveeva	1230–1234
	The stability of linear equations of neutral type V. B. Kolmanovskii	1235–1246
	Differential equations with deviating argument dependent on the derivative of the solution, considered in a Banach space with a cone L. A. Zhivotovskii	1247–1256
	Oscillations of linear systems with autonomous self-regulating lag R. E. Ginzburg	1257–1264
	Asymptotics of the width of lacunae in the spectrum of a Sturm–Liouville operator with periodic analytic potential S. G. Simonyan	1265–1272
	Regularization of equations with a closed linear operator O. A. Liskovets	1273–1278
	An investigation of certain classes of second order quasilinear elliptic equations. II, III A. D. Dzhabrailov	1279–1288
	The principle of limiting amplitude for the Cauchy–Poisson problem. III E. K. Isakova	1289–1297
	Remarks on the Kupradze–Aleksidze method A. B. Bakushinskii	1298–1301
	Estimates of weak solutions in $C_{l+\alpha(r)}$ of systems that are elliptic in the sense of Douglis and Nirenberg M. V. Ivanovich	1302–1307

Short Communications
	The estimation of the domains of nonnegativity of the Cauchy function and its derivatives up to order $n-1$ for an $n$th order ordinary linear differential equation N. Z. Gabbasov, E. S. Chichkin	1308–1310
	The stability in the large of the zero solution of certain nonlinear third order differential equations L. I. Burganskaya	1311–1313
	The stability in the large of the zero solution of certain nonlinear fourth order differential equations L. I. Burganskaya	1314–1317
	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	1318–1319
	Partial differential equations with involutions I. Ya. Viner	1320–1322
	Nearly periodic solutions of a system of Volterra equations V. R. Vinokurov	1323–1324
	The approximate solution of nonlinear integro-difference equations by the method of averaging functional corrections M. M. Gal'	1325–1328
	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	1329–1332

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