Differ. Uravn., 1983, Volume 19, Number 9

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1983, Volume 19, Number 9

Ordinary Differential Equations
	Extension of the Sturm theorem to equations with retarded argument A. I. Domoshnitskii	1475
	Stability of nonlinear systems. II. Discussion of results and examples A. V. Zhevnyak	1482
	Necessary conditions for optimality with respect to the minimax of program control in the presence of constraints E. I. Zheleznov	1487
	Stability in the large of a second-order system in a special case G. S. Krechetov	1495
	Typical properties of conditional exponential stability. II V. M. Millionshchikov	1503
	On the investigation of equations with one degree of freedom, close to nonlinear integrable ones A. D. Morozov, E. L. Fedorov	1511
	Application of certain results of branching theory in the solution of degenerate differential equations N. A. Sidorov, O. A. Romanova	1516
	Degenerate systems and a degenerate parameter V. P. Skripnik	1527
	Sharp upper and lower bounds for characteristic indices of a two-dimensional system with bounded perturbations A. G. Surkov	1534
	On the question of the sign of the Green function A. L. Teptin	1542
	Spectral properties of operators generating equations of KdV type E. Kh. Khristov	1548

Partial Differential Equations
	Global solution of a first-order partial differential equation. I Y. A. Belov	1558
	Existence and uniqueness of the solution of the Cauchy problem for a spatially nonhomogeneous coagulation equation A. V. Burobin	1568
	A mixed problem of diffraction of a vertical dipole on a disk lying on the boundary between two media in the absence of axial symmetry E. A. Ivanov	1579
	Some properties of spectral expansions corresponding to an elliptic selfadjoint operator with discontinuous coefficients M. V. Suchkov	1585
	Some weighted anisotropic inequalities A. S. Fokht	1593
	The mean-value theorem for an elliptic equation A. R. Khalmukhamedov	1601

Short Communications
	Polynomial approximation of solutions of a class of singular integro-differential equations L. A. Apaicheva, I. P. Semenov	1610
	Differential equations with an area first integral M. Yu. Bogdanova, N. F. Naumovich	1613
	A remark on differential equations of neutral type M. E. Drakhlin	1617
	Localization of spectral expansions connected with elliptic pseudodifferential operators A. A. Zaitsev	1620
	Uniqueness of the solution of the modified Frankl' problem I. V. Maiorov	1624
	Controllability sets of control systems that are fibers of a foliation of codimension one A. Ya. Narmanov	1627
	A means of calculating a multiplicative integral by methods of the theory of surfaces L. Zh. Palandzhyants	1630
	An implicit function theorem and the solution of equations of neutral type A. E. Rodkina	1632
	Certain identities used in the solution of boundary value problems by the method of finite integral transformations Yu. È. Senitskii	1636
	Analytic equivalence of compressible diffeomorphisms in the neighborhood of an invariant torus S. P. Tokarev	1638
	The averaging principle for systems with “fast” and “slow” variables M. M. Khapaev, O. P. Filatov	1640

Chronicle
	О семинаре по качественной теории дифференциальных уравнений в Московском университете	1644