Differ. Uravn., 1990, Volume 26, Number 9

Differentsial'nye Uravneniya

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1990, Volume 26, Number 9

Ordinary Differential Equations
	The comparison method for differential equations with impulse action M. U. Akhmetov, N. A. Perestyuk	1475–1483
	Some identities for eigenvalues and eigenfunctions of a class of fourth-order differential operators R. Sh. Bakuradze, I. V. Stankevich	1483–1490
	Positivity of the Cauchy function and stability of linear differential equations with aftereffect L. M. Berezanskii	1490–1500
	An analogue of the Newton diagram method for a class of singularly perturbed differential equations. II G. S. Zhukova	1500–1509
	“Hereditary” properties of systems of operator equations Yu. F. Korobeinik	1510–1521
	Optimal trajectories of differential inclusions in a problem with constraints on the ends of the trajectories L. I. Minchenko	1521–1528
	Testing the transversality condition by the methods of symbolic dynamics G. S. Osipenko	1528–1536
	A spectral problem that is connected with an equation of viscous sound V. N. Pyvovarchyk	1536–1541
	A class of linear differential and discrete games between groups of pursuers and evaders N. Yu. Satimov, M. Sh. Mamatov	1541–1551
	Estimates for the solutions of an ordinary differential equation with a parameter and functional conditions S. Ya. Yakubov, È. Ch. Ibragimov	1551–1562

Partial Differential Equations
	On an inverse problem for the Laplace operator with continuous potential V. V. Dubrovskii, A. V. Nagornyi	1563–1567
	A three-point mixed problem with an integral condition with respect to the space variable for second-order parabolic equations A. V. Kartynnik	1568–1575
	The Tikhonov problem for second-order linear parabolic equations Ya. S. Kushitsky	1576–1585
	Boundary value problems for systems of third-order differential equations V. A. Malovichko	1585–1589
	Some integral expansions of an arbitrary function in Legendre function A. I. Moshinskii	1589–1598
	Solvability of linear differential equations in scales of Roumieu spaces that are constructed by means of a given unbounded linear operator V. I. Nazarov	1598–1608
	Estimates for potentials with oscillating kernels that are connected with the Helmholtz equation V. A. Nogin, B. S. Rubin	1608–1613
	On a problem of determining the parameter of an evolution equation D. G. Orlovskii	1614–1621
	Solvability of the Dirichlet problem for multidimensional elliptic systems Sh. B. Khalilov	1621–1626
	Uniqueness classes of generalized solutions of boundary value problems for parabolic equations in unbounded noncylindrical domains A. E. Shishkov	1627–1633

Short Communications
	$L_2$-estimates of the solution of model initial-boundary value problems for a system of two equations of general form with mixed parabolic-elliptic structure M. A. Abdrachmanov	1634–1635
	Asymptotic expansion with respect to the small parameter of the solution of an equation of elliptic type with a discontinuous coefficient and right-hand side V. B. Bukashkin, V. G. Sushko	1636–1637
	An inverse problem of spectral analysis on a half-line for a differential equation in a certain class M. S. Eremin	1638–1640
	Existence of solutions that are smooth with respect to the parameter for singularly perturbed equations V. I. Kachalov	1641–1643
	Numerical solution of a nonlinear Poisson equation for an electric potential in semiconductors M. M. Khapaev (Jr.)	1643–1645
	Investigation of the stability of linear differential-functional equations of retarded type by the method of Lyapunov functions D. Ya. Khusainov	1645–1646
	Exponential decrease of the solutions of linear systems with deviating argument of neutral type D. Ya. Khusainov	1647
	Analytic structure of solutions of the Sturm–Liouville problem with regular singularities M. V. Fedoryuk	1648–1650

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