Differ. Uravn., 1977, Volume 13, Number 3

Differentsial'nye Uravneniya

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1977, Volume 13, Number 3

Ordinary Differential Equations
	Some questions on the controllability of two-dimensional systems N. K. Alekseev	387–397
	A priori estimates of the solutions of a two-point boundary value problem N. A. Bobylev	398–405
	Limit cycles and Darboux integrals in the case of a node M. V. Dolov	406–415
	On the problem of the decomposability of linear systems Yu. I. Elefteriadi	416–426
	Extremal arcs and extended Hamiltonian systems F. Clarke	427–442
	Topological equivalence of linear actions of $\mathbf R^2$ on $\mathbf R^n$ N. N. Ladis	443–448
	Observability of dynamical systems with lag by a group of filters V. V. Mulyarchick	449–454
	Asymptotic finite-dimensionality of the space of solutions of a certain class of systems with lag P. S. Pankov	455–462
	The index of a singular point of the equation $y'=\frac{P_4(x,y)}{Q_4(x,y)}$ P. T. Cherevichny	463–467
	A problem with nonlocal boundary conditions for operator-differential equations of odd order V. I. Chesalin	468–476

Partial Differential Equations
	The mixed boundary value problem for a second order linear elliptic equation T. M. Kerimov	477–480
	Uniqueness and membership in the class $W_2^1$ of the classical solution of a mixed problem for hyperbolic systems of A. V. Bicadze type in an arbitrary cylinder N. M. Krukovskii	481–488
	The variational method for the solution of degenerate elliptic equations in a half-space I. I. Matveeva	489–496
	Solution of a mixed problem for a second order parabolic equation under boundary conditions of mixed type M. L. Rasulov, Ya. M. Suleimanov	497–508
	On the problem of determining the right hand side of hyperbolic systems V. G. Romanov	509–515
	Completely continuous imbeddings in weighted classes of functions, and conditions for discreteness of the spectrum of a nonregular elliptic operator J. V. Rybalov	516–528
	The plane inverse problem for magnetic potential P. B. Sulyandziga	529–537
	The behavior near the boundary of the derivatives of the solution of a certain boundary value problem M. F. Timan	538–543
	A uniqueness theorem for a certain inverse problem for a hyperbolic equation V. G. Yakhno	544–551

Short Communications
	The entire solutions of a linear functional-differential system I. Ya. Viner	552–555
	Complete controllability of linear systems with variable structure B. S. Kalitin	556–558
	Multivariable control systems L. E. Kanarev	559–560
	The controllability of a linear system in a Banach space M. M. Kopets	561–563
	Über eine singuläre Integralgleichung auf der Riemannschen Fläche einer algebraischen Funktion V. E. Kruglov	564–566
	A support principle for difference inclusions L. I. Minchenko	567–569

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