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1983, Volume 19, Number 8  


Ordinary Differential Equations
Behavior at infinity of optimal trajectories of an object
V. G. Boltyanskii
1291
Investigation of the stability of solutions of certain nonlinear multidimensional differential systems
L. I. Burganskaya
1300
Estimation of the growth of solutions of a piecewise constant system
B. F. Bylov, È. A. Tikhonova
1310
The spectrum and spectral singularities of differential operators with periodic complex-valued coefficients
O. A. Veliev
1316
Problems of optimization with controls in the coefficients of a parabolic equation
A. D. Iskenderov, R. K. Tagiyev
1324
On the question of the construction of periodic solutions of nonautonomous differential equations
V. N. Laptinskii
1335
Typical properties of conditional exponential stability. I
V. M. Millionshchikov
1344
Invariant and stable families of sets with respect to differential inclusions
T. Nguyễn
1357
The “Cossack-robber” differential game
N. N. Petrov, N. Nikandrovich Petrov
1366
Stability under constantly acting perturbations
N. V. Puhareva
1374
Sharp estimates for eigenfunctions of an arbitrary nonselfadjoint Schrödinger operator
V. V. Tikhomirov
1378
Global phase portrait of a two-dimensional system of a special type
Sh. R. Sharipov, A. M. Matvienko
1385

Partial Differential Equations
Divergence of expansions in eigenfunctions
A. I. Bastis
1390
An analogue of the Phragmén–Lindelöf theorem
M. D. Bronshtein
1400
On the Landau equation
O. E. Buryak
1406
Addition theorems connected with toroidal, cylindrical and spherical harmonic functions
V. T. Erofeenko
1416
Boundary value problems for operator-differential equations of mixed type
N. V. Kislov
1427
On the problem of determining the right-hand side of a hyperbolic system
D. G. Orlovskii
1437

Short Communications
Linear systems with a triangular reflecting function
L. A. Al'sevich
1446
Stability of solutions of some classes of linear differential equations with oscillating coefficients
V. Sh. Burd
1450
Determination of the domain of exponential stability of systems of differential equations
M. I. Gil'
1452
Refinement of bounds for highest exponents in the freezing method
N. A. Izobov
1454
A counterexample in the theory of difference operators
A. G. Kamenskii
1457
An approximate solution of the Stefan problem on an interval
S. A. Labutin
1458
Conditions for the absence of circular motions in $n$-connected Froude pendulums of different masses
V. S. Serebryakova
1462
 
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