Differentsial'nye Uravneniya
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1981, Volume 17, Number 2  

Ordinary Differential Equations
Some forms of local controllability
A. V. Boltyanskii 		203–209
Syzygies between centroaffine invariants of a quadratic differential system
V. I. Danilyuk, K. S. Sibirskii 		210–219
Asymptotically equivalent two-dimensional linear differential systems
S. A. Mazanik 		220–226
Third-order systems with a moving singular curve
I. P. Martynov 		227–232
TM-equivalence and classification of noncompact invariant sets of dynamical systems
I. G. Petrovskaya 		233–240
Representation of solutions in the neighborhood of fixed branching points of a problem on motion of a rigid body around a fixed point
A. I. Yablonskii, E. I. Danilova, V. I. Eroshevskaya 		241–246

Partial Differential Equations
The Cauchy problem for operators that decompose into factors with singularities
S. A. Aldashev 		247–255
Behavior of the solution of some boundary value problems when the order of the equation increases indefinitely
G. S. Balashova 		256–269
Solution of nonlinear boundary value problems that depend on a parameter for systems of second-order partial differential equations
A. V. Borodin 		270–277
Multidimensional linear passive systems in Hilbert space
R. Kh. Galeev 		278–285
Convergence of the solution of a mixed problem for a hyperbolic system on the plane with singularly perturbed boundary condition to the solution of a degenerate
V. N. Gol'dberg 		286–300
Integral equations of convolution on the half axis with semi-almost-periodic presymbols
R. V. Duduchava, A. I. Saginashvili 		301–312
The Goursat problem for a loaded integro-differential equation
V. M. Kaziev 		313–319
Necessary and sufficient conditions for correct solvability of a boundary value problem in a layer for systems of partial differential equations
À. À. Makarov 		320–324
The Tricomi problem for the Lavrent'ev–Bitsadze equation
E. I. Moiseev 		325–338
A boundary value problem with shift for a generalized Tricomi problem
I. Orazov 		339–344
A new method for calculating electromagnetic fields in fine-grained and continuous media
V. I. Paškovskii 		345–353
Behavior as $t\rightarrow \infty $ of solutions of mixed problems for a three-dimensional wave equation in a domain cylindrical with respect to the space variables
V. M. Favorin 		354–365
Solution of nonlinear equations with monotone mapping in Hilbert space
A. A. Fonarev 		366–372
Linear systems of first-order partial differential equations with semiregular degeneration on a hyperplane
V. Kh. Froim 		373–382

Short Communications
Problem of the points of bifurcation in the case of several parameters
Yu. B. Rusak 		383–386
 
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