Differ. Uravn., 1977, Volume 13, Number 6

Differentsial'nye Uravneniya

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1977, Volume 13, Number 6

Ordinary Differential Equations
	On the question of the isochronism of the center of two-dimensional analytic differential systems V. V. Amel'kin	971–980
	Formal and analytic equivalence of real systems of differential equations V. V. Basov	981–991
	Asymptotic solution of differential equations in a Hilbert space M. A. Valiev	992–995
	The periodic boundary value problem for a two-dimensional differential system I. T. Kiguradze	996–1007
	Asymptotic solution of a weakly nonlinear system A. I. Kobrin, Yu. G. Martynenko	1008–1019
	Some properties of Ljapunov functions G. S. Krechetov	1020–1025
	The boundedness of the solutions of a certain multidimensional system in the critical case of one zero root. I N. N. Kushkov	1026–1037
	Construction of Ljapunov functions for systems of linear differential equations O. B. Lukova, A. A. Boichuk	1038–1046
	A geometric treatment of the oscillatory properties of third order linear differential equations A. D. Myshkis, V. G. Èventov	1047–1052
	The combination of control and observation processes in problems of game deviation of motion O. I. Nikonov	1053–1060
	Conditions for the occurrence of the problem of center and focus A. V. Skitovich	1061–1069
	Conditions for the existence of solutions of multivalued differential equations A. F. Filippov	1070–1078
	Criteria for the stability of sets with respect to a nonautonomous differential system A. A. Shestakov	1079–1090
	The minimality of sets and the Poisson stability of motions in homomorphic dynamical systems B. A. Shcherbakov, N. S. Fal'ko	1091–1097

Partial Differential Equations
	On the theory of boundary value problems for equations of mixed type in space V. N. Vragov	1098–1105
	The method of monotonicity in the theory of nonlinear singular integral and integro-differential equations G. M. Magomedov	1106–1112
	A quadratic functional for the heat equation V. M. Filippov, A. N. Skorohodov	1113–1123

Short Communications
	The probability of the stability of systems of differential equations with constant coefficients that depend on a random parameter A. A. Akhrem	1124–1125
	Moving singularities of a certain class of systems of third order differential equations P. P. Veresovich	1126–1128
	Über die auf der Verbindungsstrecke zwischen unbeweglichen singulären Punkten holomorphen Lösungen einer nichtlinearen Differentialgleichung R. G. Grabovskaya, V. G. Oskrogo	1129–1130
	Conditions for the existence of the maximal number of polynomial solutions of algebraic differential equations P. Lazov, D. Dimitrovski	1131–1134
	Systems with a piecewise constant matrix of coefficients I. I. Martynov	1135–1137
	Differential systems with non-negative normed solutions Yu. A. Pykh	1138–1140
	Zur Theorie der vollen Steuerbarkeit von Systemen mit Retardierung nach dem Zustand G. P. Razmyslovich	1141
	The normal form of an analytic system of differential equations in the case of a structurally unstable focus S. P. Tokarev	1142–1144
	The existence of saddle periodic solutions of Duffing's equation without dissipation V. E. Chernyshev	1145–1148

	Владимир Михайлович Шалов (некролог) K. A. Bezhanov, O. V. Besov, A. V. Bitsadze, I. A. Borachinsky, A. A. Vasharin, V. S. Vladimirov, N. V. Zvolinsky, V. A. Il'in, V. P. Korobeinikov, L. D. Kudryavtsev, L. P. Kuptsov, P. I. Lizorkin, Yu. I. Makarychev, V. E. Mirakov, V. P. Mikhailov, E. F. Mishchenko, S. M. Nikol'skii, Yu. S. Nikol'skii, A. P. Novikov, T. S. Pigolkina, S. I. Pokhozhaev, E. A. Romishevsky, S. L. Sobolev, S. V. Uspenskii, M. I. Shabunin, G. N. Yakovlev	1149–1153

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