Geodesic

Sommaire du Fascicule no. 1

Solvability of the Dirichlet problem for quasilinear equations with a non-negative characteristic form
p. 3-9
A certain boundary value problem for mixed parabolic-hyperbolic equations with a characteristic line of change of type
p. 10-16
A certain estimate for elliptic equations and its application to loaded equations
p. 17-22
A certain new spectral problem
p. 23-28
The Cauchy problem for a certain quasilinear degenerate equation
p. 29-35
Certain boundary value problems for equations of composite type
p. 36-43
A variational problem for equations of mixed type
p. 44-49
The Dirichlet problem for a certain class of third order equations
p. 50-55
An analogue of the Tricomi problem for mixed parabolic-hyperbolic equations with a noncharacteristic line of change of type
p. 56-63
On the theory of boundary value problems for mixed type equations in multidimensional domains. I
p. 64-75
The Gevrey problem for a certain mixed-parabolic equation
p. 76-83
The normal solvability in the sense of Hausdorff of the Dirichlet problem for a degenerate elliptic system of second order equations
p. 84-89
Certain boundary value problems for a pseudoparabolic equation
p. 90-99
A problem of Frankl' type for third order equations
p. 100-104
Boundary value problems for loaded parabolic equations and their applications to the prediction of ground water level
p. 105-110
A criterion for discreteness of the spectrum for a certain degenerate operator, and certain imbedding theorems
p. 111-120
Connected partial differential operators with different principal parts
p. 121-125
Complete families of solutions of systems of degenerate elliptic equations
p. 126-132
A certain boundary value problem with shift for a mixed type equation with two lines of degeneracy
p. 133-139
On the theory of singular integro-functional operators
p. 140-154
Multidimensional generalizations of C.~Morawetz' theorem on the weak solvability of a system of mixed type differential equations
p. 155-158
A certain property of the solution of a system of Euler--Poisson--Darboux equations in a doubly connected domain
p. 159-162
A difference method for the solution of a certain loaded parabolic type equation
p. 163-167
A certain boundary value problem for a second order mixed type equation with several parallel lines of degeneracy
p. 168-169
On the theory of fractional differentiation
p. 170-173
An inverse problem for a Cauchy type integral
p. 174-176
Juri{\v\i} Alekseevi{\v{c}} Mitropol'ski{\v\i} (on the occasion of his 60th birthday)
p. 177-184
Объединенный семинар по уравнениям смешанного типа и родственным проблемам

Sommaire du Fascicule no. 2

Construction of the equations of motion
p. 195-237
The Riemann problem. III.~The case $n=2$ and $m=4$
p. 238-254
Topological equivalence of hyperbolic linear systems
p. 255-264
Admissible changes of time
p. 265-270
Conditions for the center for a certain equation
p. 271-275
Elliptic systems that are degenerate at a point
p. 276-284
A mixed problem for a certain nonlinear hyperbolic-parabolic equation
p. 285-289
A boundary value problem for a system of second order equations of composite type
p. 290-293
The solution of a certain boundary value problem of the theory of heat conduction with a nonclassical boundary condition
p. 294-304
The inverse problem of potential theory for hyperbolic equations
p. 305-313
Theorems on the coincidence of the classical solution of the Dirichlet problem with the generalized solution of this problem from the class $W_2^1$ for second order elliptic systems of A.\,V.~Bicadze type
p. 314-323
Unique solvability of boundary value problems for certain operator-differential equations
p. 324-335
Diffraction of a cylindrical wave by a double parabolic cylinder with apertures
p. 336-343
Direct methods for studying the singularities of the sums of Laplace series that lie on the boundary of a ball of convergence
p. 344-357
An algorithm and a FORTRAN program for determining the elements of optimal synthesis for a second order system of general form that is linear in the control
p. 358-361
The central index for systems of linear difference equations
p. 362-363
An application of the analytic theory of differential equations to the determination of conditions for the single-valuedness of algebraic functions
p. 364-366
An analogue of the Bendixson criterion for a third order equation
p. 367-368
Some problems for a certain degenerate hyperbolic system
p. 369-372
The topological structure of the set of initial values of a Ljapunov stable system
p. 373-375
The first boundary value problem for a second order equation with small parameters multiplying the derivatives
p. 376-378

Sommaire du Fascicule no. 3

Some questions on the controllability of two-dimensional systems
p. 387-397
A priori estimates of the solutions of a two-point boundary value problem
p. 398-405
Limit cycles and Darboux integrals in the case of a node
p. 406-415
On the problem of the decomposability of linear systems
p. 416-426
Extremal arcs and extended Hamiltonian systems
p. 427-442
Topological equivalence of linear actions of $\mathbf R^2$ on $\mathbf R^n$
p. 443-448
Observability of dynamical systems with lag by a group of filters
p. 449-454
Asymptotic finite-dimensionality of the space of solutions of a certain class of systems with lag
p. 455-462
The index of a singular point of the equation $y'=\frac{P_4(x,y)}{Q_4(x,y)}$
p. 463-467
A problem with nonlocal boundary conditions for operator-differential equations of odd order
p. 468-476
The mixed boundary value problem for a second order linear elliptic equation
p. 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
p. 481-488
The variational method for the solution of degenerate elliptic equations in a half-space
p. 489-496
Solution of a mixed problem for a second order parabolic equation under boundary conditions of mixed type
p. 497-508
On the problem of determining the right hand side of hyperbolic systems
p. 509-515
Completely continuous imbeddings in weighted classes of functions, and conditions for discreteness of the spectrum of a nonregular elliptic operator
p. 516-528
The plane inverse problem for magnetic potential
p. 529-537
The behavior near the boundary of the derivatives of the solution of a certain boundary value problem
p. 538-543
A uniqueness theorem for a certain inverse problem for a hyperbolic equation
p. 544-551
The entire solutions of a linear functional-differential system
p. 552-555
Complete controllability of linear systems with variable structure
p. 556-558
Multivariable control systems
p. 559-560
The controllability of a linear system in a Banach space
p. 561-563
\"Uber eine singul\"are Integralgleichung auf der Riemannschen Fl\"ache einer algebraischen Funktion
p. 564-566
A support principle for difference inclusions
p. 567-569

Sommaire du Fascicule no. 4

Second order matrix differential equations
p. 579-591
Computation of the optimal control in a certain nonsmooth optimization problem
p. 592-600
The Cauchy formula for a functional-differential equation
p. 601-606
A method of {\v C}aplygin type in a boundary value problem for a second order nonlinear differential equation
p. 607-615
Linear systems that are connected by a relation of almost reducibility with systems of scalar type
p. 616-625
L\"osbarkeit von Randwertproblemen f\"ur einige Operator- Differentialgleichungen
p. 626-636
An analogue of the multipoint problem for a hyperbolic equation with constant coefficients
p. 637-645
On the construction of solution structures for boundary value problems
p. 646-653
The regularity of boundary points for second order degenerate elliptic equations
p. 654-667
The existence of a value for a certain class of differential games that can be described by a Goursat problem
p. 668-681
Solution of a mixed problem for an equation of parabolic type with discontinuous coefficients
p. 682-692
Properties of the solution of a certain Dirichlet problem on the plane with cuts
p. 693-704
On the stability of the solutions of a certain class of discrete systems
p. 705-710
\"Uber Differenzen-Differentialapproximationen mehrdimensionaler Probleme der optimalen Steuerung mit r\"aumlich verteilten Parametern
p. 711-717
Asymptotic behavior of the solution of a difference boundary value problem with the step as the small parameter
p. 718-723
Systems of elements of a space over a space, and variational methods for the solution of equations with variable operators
p. 724-732
Third order homogeneous differential equations with univalent polar variable singular points
p. 733-734
A test for the absolute stability of oscillations in control systems with a nonstationary linear part
p. 735-737
A boundary value problem for singularly perturbed differential and difference systems when the unperturbed system lies on the spectrum
p. 738-742
Conditions for nonlocal continuability of the integral curves of vector fields
p. 743-744
Approximate solution of nonlinear differential equations by means of approximation by Gaussian functions
p. 745-748
Inequalities of Gronwall, Bihari and Langenhop type for Pfaffian systems
p. 749-752
Limit cycles of a system of relay type with polynomial right-hand side
p. 753-755
The stability of nonlinear differential and finite difference systems
p. 756-757
Certain properties of an elliptic problem of Sobolev
p. 758-760
The Bicadze--Samarski{\v\i} problem for an equation of parabolic type
p. 761-762
Second order equations with operators that generate semigroups with singularities
p. 763-765
Smooth conjugacy of systems of differential equations in the neighborhood of an asymptotically stable complex singular point
p. 766-769

Sommaire du Fascicule no. 5

Methods for estimating the number of limit cycles of autonomous systems
p. 779-802
Geometric classification of a quadratic differential system
p. 803-814
A construction of the fundamental matrix of solutions of a certain system of differential equations, and a study of its behavior
p. 815-825
Characteristic vectors of the solutions of linear homogeneous Pfaffian systems
p. 826-840
Further development of the theorem of N.\,G.~{\v C}etaev on the instability of motion
p. 841-847
The minimal exponent of a two-dimensional linear differential system
p. 848-858
Integrability of Abel equations of general form by means of functions that are solutions of second order linear equations
p. 859-863
Remarks on stationary integrals, and stationary transformations of nonautonomous differential systems
p. 864-868
Construction of the equations of programmed motions
p. 869-873
Cycles in phase portraits of Morse--Smale systems
p. 874-882
Uniformly bounded solutions of linear systems of differential equations
p. 883-891
Smooth equivalence of systems of differential equations on the plane in the case of a structurally unstable focus
p. 892-897
Asymptotically Poisson stable motions of dynamical systems, and their comparability with regard to the recurrence property in the limit
p. 898-906
The problem of the excitation of an arbitrary spheroid by a dipole emitter
p. 907-919
Solution of a mixed problem for a second order parabolic equation that contains a time derivative in the boundary condition
p. 920-930
A boundary value problem for an equation of mixed type of the second kind with displacement
p. 931-943
A system with one zero root of the characteristic equation
p. 944-946
A certain type of perturbed Bessel equation, and a particular solution of it
p. 947-948
A method of finding periodic solutions of autonomous systems of differential equations
p. 949-950
Topological equivalence of nonautonomous equations
p. 951-953
A property of matrix exponentials
p. 954-955
Asymptotic stability of the solutions of a certain linear system
p. 956-957
Tests for the instability of a set with respect to a nonautonomous differential system
p. 958-960
Nikola{\v\i} Pavlovi{\v{c}} Erugin (on the occasion of his seventieth birthday)
p. 961-962

Sommaire du Fascicule no. 6

On the question of the isochronism of the center of two-dimensional analytic differential systems
p. 971-980
Formal and analytic equivalence of real systems of differential equations
p. 981-991
Asymptotic solution of differential equations in a Hilbert space
p. 992-995
The periodic boundary value problem for a two-dimensional differential system
p. 996-1007
Asymptotic solution of a weakly nonlinear system
p. 1008-1019
Some properties of Ljapunov functions
p. 1020-1025
The boundedness of the solutions of a certain multidimensional system in the critical case of one zero root. I
p. 1026-1037
Construction of Ljapunov functions for systems of linear differential equations
p. 1038-1046
A geometric treatment of the oscillatory properties of third order linear differential equations
p. 1047-1052
The combination of control and observation processes in problems of game deviation of motion
p. 1053-1060
Conditions for the occurrence of the problem of center and focus
p. 1061-1069
Conditions for the existence of solutions of multivalued differential equations
p. 1070-1078
Criteria for the stability of sets with respect to a nonautonomous differential system
p. 1079-1090
The minimality of sets and the Poisson stability of motions in homomorphic dynamical systems
p. 1091-1097
On the theory of boundary value problems for equations of mixed type in space
p. 1098-1105
The method of monotonicity in the theory of nonlinear singular integral and integro-differential equations
p. 1106-1112
A quadratic functional for the heat equation
p. 1113-1123
The probability of the stability of systems of differential equations with constant coefficients that depend on a random parameter
p. 1124-1125
Moving singularities of a certain class of systems of third order differential equations
p. 1126-1128
\"Uber die auf der Verbindungsstrecke zwischen unbeweglichen singul\"aren Punkten holomorphen L\"osungen einer nichtlinearen Differentialgleichung
p. 1129-1130
Conditions for the existence of the maximal number of polynomial solutions of algebraic differential equations
p. 1131-1134
Systems with a piecewise constant matrix of coefficients
p. 1135-1137
Differential systems with non-negative normed solutions
p. 1138-1140
Zur Theorie der vollen Steuerbarkeit von Systemen mit Retardierung nach dem Zustand
The normal form of an analytic system of differential equations in the case of a structurally unstable focus
p. 1142-1144
The existence of saddle periodic solutions of Duffing's equation without dissipation
p. 1145-1148
Владимир Михайлович Шалов (некролог)
p. 1149-1153

Sommaire du Fascicule no. 7

Boundary value problems with a small parameter for ordinary linear differential equations
p. 1163-1170
Linearization of nonautonomous differential systems in the neighborhood of a point of equilibrium
p. 1171-1184
The variational method for the solution of boundary value problems for certain linear differential equations with deviating argument
p. 1185-1191
A study of the behavior of cascade trajectories in the neighborhood of an invariant set
p. 1192-1201
A criterion of Matrosov stability for functional-differential equations of lagging type
p. 1202-1207
Stabilizability and convergence in second order nonlinear systems
p. 1208-1213
A class of integrable systems with a small parameter
p. 1214-1217
A system of equations that are degenerate on the plane
p. 1218-1224
The uniqueness of the solution of the fundamental initial problem for partial differential equations with a deviating argument
p. 1225-1232
Certain problems that are connected with the theory of a transversal shock along rods
p. 1233-1243
The smoothness of the solutions of a class of degenerate elliptic equations
p. 1244-1255
The continuity of the solutions of second order quasilinear elliptic systems
p. 1256-1263
An abstract theorem of perturbation theory, regularized trace formulas, and the zeta function of operators
p. 1264-1271
The calculation of the asymptotics of the energy radiated by an almost periodic source of oscillations as $t\rightarrow \infty $
p. 1272-1280
Regularized trajectories of a Newton type approximation for the solution of nonlinear equations
p. 1281-1292
Difference approximations on a rectangular net of the first boundary value problem for the Laplace equation with discontinuous boundary conditions
p. 1293-1298
Direct methods for solving equations of jet theory
p. 1299-1307
Certain tests for the stability of linear discrete systems
p. 1308-1313
Difference schemes with a fixed sign remainder term for the equation $y^{(n)}=f(t,y)$ with linear boundary conditions
p. 1314-1319
Sufficient optimality conditions for difference inclusions
p. 1320-1324
On the question concerning the solutions of ordinary differential equations with singular initial conditions
p. 1325-1326
Struktur des fokussierenden Magnetfelds
p. 1327-1329
Focusing of charged particles in the vicinity of a given equilibrium trajectory
p. 1330-1332
The relay stabilization of nonlinear control systems
p. 1333-1334
A criterion for the solvability of certain periodic boundary value problems
p. 1335-1337
A comparison theorem for systems of two differential equations
p. 1338-1340
Boundary value problems for equations with a Legendre operator
p. 1341-1343
Letter to the editors: ``Theorems on the $m$-fold completeness of the generalized eigen- and associated functions from $W_2^1$

Sommaire du Fascicule no. 8

A formula for the frequency number of axially symmetric oscillations of rotating shells
p. 1355-1365
Separation and $e$-splitting of almost periodic systems
p. 1366-1374
Absolute stability of automatic control systems with lag
p. 1375-1383
The reduction to simplest form of a system of linear differential equations with a small parameter multiplying the derivative
p. 1384-1389
Convergence in a system of two equations with dissipation
p. 1390-1401
Linear differential equations in locally convex spaces. I.~Regular operators and their properties
p. 1402-1410
Solutions of operator equations that are asymptotically stable in the sense of Poisson
p. 1411-1417
The spectrum of the Tricomi problem for the Lavrent'ev--Bicadze equation
p. 1418-1425
Solution of some systems of partial differential equations
p. 1426-1433
The principle of a minimum of a quadratic functional for a boundary value problem of heat conduction
p. 1434-1445
Some partial differential equations that are degenerate on a hyperplane
p. 1446-1453
A theorem on the behavior at infinity of the solutions of a partial differential equation
p. 1454-1459
The existence and uniqueness of the solution of the coagulation equation
p. 1460-1470
The Wiener--Hopf integral equation with a symbol that has a zero of fractional order
p. 1471-1478
A well-posed problem for singular integral equations with a symbol that goes to zero
p. 1479-1486
Methods for the approximate solution of some classes of linear integral equations that occur in control theory
p. 1487-1492
On the numerical solution of singular integral equations of the first kind
p. 1493-1502
The limit absorption principle, the limit amplitude principle and partial radiation conditions for a boundary value problem in an $n$-dimensional layer for the Helmholtz equation
p. 1503-1505
A remark on the principle of averaging on the whole real line for equations of neutral type
The existence of a knotted solution for a third order autonomous system
p. 1507-1508
The Cauchy formula for linear equations with functional derivatives
p. 1509-1511
A boundedness criterion for the solutions of linear difference-differential equations with retarded argument in Banach spaces
p. 1512-1515
The integration of a Riccati equation, and the determination of a particular solution for certain equations
p. 1516-1520
The uniqueness of the generalized solution of a certain problem in shock theory
p. 1521-1523
The existence of a continuous branch for the eigenfunctions of a nonlinear elliptic boundary value problem
p. 1524-1527
The asymptotic stability of self-adjustment algorithms in first order systems with lag
p. 1528-1531
Behavior of the solutions of equations with transformed argument
p. 1532-1533
The functionally invariant solutions of a second order quasilinear partial differential equation
p. 1534-1536
Letter to the editors: ``On the question of the isochrony of the center of two-dimensional analytic differential systems'' (Differencial'nye Uravnenija \textbf{13} (1977), no.~6, 971--980)
Letter to the editors: ``The boundedness of the infinitely continuable solutions of a system of two differential equations with quadratic right hand sides'' (Differencial'nye Uravnenija \textbf{11} (1975), no.~11, 2019--2026)

Sommaire du Fascicule no. 9

Stability, unboundedness and dichotomy of the solutions of a class of functional-differential equations
p. 1547-1557
Approximate optimal control of motion under the action of Poisson and Gaussian random perturbations
p. 1558-1569
Fuchsian systems of differential equations on a complex projective space
p. 1570-1580
The absence of real multipliers for an $n$-dimensional periodic system of order $4m+2$
p. 1581-1587
Fundamental solutions of operator-differential equations
p. 1588-1597
The boundedness of the solutions of a certain multidimensional system in the critical case of one zero root. II
p. 1598-1605
The global stability of the zero solution of a system of two differential equations
p. 1606-1614
Linear differential equations in locally convex spaces. II.~Properties of the solutions
p. 1615-1624
Tihonov's theorem for an equation with a Fredholm operator
p. 1625-1636
Some imbedding theorems for a class of singular fractional-differential operators
p. 1637-1647
Solution of a mixed problem for a second order parabolic system in domains with nonsmooth contours
p. 1648-1657
Solution of a problem of a longitudinal shock along an inhomogeneous viscoelastically relaxing rod
p. 1658-1666
The joining together of degenerate elliptic equations.~I
p. 1667-1677
The WKB method for the system $(-{}ih\partial /\partial t+{\cal A}(x,t,-{}ih\partial /\partial x))U=0$ in the case of characteristics of variable multiplicity
p. 1678-1691
A class of singular integral equations with involution, and its applications in the theory of boundary value problems for partial differential equations.~I
p. 1692-1700
The existence of periodic solutions for certain nonlinear problems
p. 1701-1708
The Riemann function for the equation $\Delta u_m+\frac1r\cdot\frac{\partial u_m}{\partial r}+\bigl(1-\frac{m^2}{r^2}\bigr)u_m=0$
p. 1709-1712
A group interpretation of nonlinear wave equations that are integrable by the method of the inverse problem of scattering theory
p. 1713-1715
Linear partial differential equations in function spaces
p. 1716-1719
Stability of integral manifolds
p. 1720-1722
Correct solvability of a difference Cauchy problem with a variable operator in a Bochner space
p. 1723-1726
Boundary value problems for a class of differential operators in domains with conical points
p. 1727-1729
Letter to the editors: ``A mathematical treatment of a certain problem of a longitudinal shock along a relaxing rod'' (Differencial'nye Uravnenija \textbf{12} (1976), no.~4, 668--685)

Sommaire du Fascicule no. 10

Stabilization of the solutions in a differential-difference game of approach
p. 1739-1743
On the problem of control from incomplete data
p. 1744-1748
On the question of conditions for the reducibility of functional-differential equations to canonical form
p. 1749-1756
Construction of a force function from given properties of the motion
p. 1757-1763
Control of motion in configuration space
p. 1764-1769
The spectrum of an operator with commensurable deviations of the argument and with constant coefficients
p. 1770-1775
A non-improvable estimate of the interval of disconjugacy for a linear differential equation with coefficients that are bounded in $L_r$
p. 1776-1786
Hankel matrices and differential systems with elementary solutions
p. 1787-1791
The coming together of the solutions of Li\'enard's equation
p. 1792-1795
Linear differential equations in locally convex spaces. III.~Examples of regular operators
p. 1796-1803
A method for the numerical solution of a class of operator equations of the first kind
p. 1804-1814
On the solvability of the problem of the accumulation of perturbations for linear differential equations with retarded argument
p. 1815-1820
A problem of deviation under conditions of incomplete information
p. 1821-1828
The construction of boundary functions in certain singularly perturbed problems of elliptic type
p. 1829-1835
Stability of the solutions of certain quasilinear parabolic equations
p. 1836-1844
The joining together of degenerate elliptic equations.~II
p. 1845-1854
The method of a priori estimates in the Cauchy problem for I.\,G.~Petrovski{\v\i} well-posed systems of equations with variable coefficients
p. 1855-1866
The solution of nonlinear equations with monotone operators on sets in a Banach space
p. 1867-1870
A peculiarity in the theory of the stability of motion with aftereffect
p. 1871-1872
An estimate of the convergence of the Ritz and least squares methods for certain problems
p. 1873-1875
Spectral controllability of systems with lag
p. 1876-1878
A differential equation with a moving singular line
p. 1879-1881
Transformation of systems with retarded argument
p. 1882-1884
Smooth linearization of a ``node''
p. 1885-1887
The linear optimal control problem with lag and a quadratic functional
p. 1888-1890
Dependence on parameters of the solutions of evolution equations
p. 1891-1893
The continuous gradient method in the problem of the analytical design of regulators
p. 1894-1896
A variant of the Phragm\'en--Lindel\"of theorem for the solutions of a system of differential equations
p. 1897-1899
Conditions for the convergence of superpositions
p. 1900-1901
Всесоюзная конференция по качественной теории
Letter to the editors: ``The solution of a certain boundary value problem of the theory of heat conduction with a nonclassical boundary condition'' (Differencial'nye Uravnenija \textbf{13} (1977), no. 2, 294--304)
Поправки к~статье: «Формула для энтропии гладких динамических систем»
Letter to the editors: ``Certain boundary value problems for a pseudoparabolic equation'' (Differencial'nye Uravnenija \textbf{13} (1977), no. 1, 90--99)

Sommaire du Fascicule no. 11

250-летний юбилей Академии наук СССР
A linear functional-differential equation of evolution type
p. 1915-1925
The development of I. Z. Štokalo's ideas on the application of the Laplace transform
p. 1926-1931
Moving singular points of third order systems of differential equations
p. 1932-1939
The representation of the fundamental matrices of completely integrable linear homogeneous Pfaffian systems with an irregular singular point
p. 1940-1950
Comparison theorems for oscillatory solutions of equations with lag
p. 1951-1956
Informational sets of control systems
p. 1957-1965
A conjugate equation for a general linear boundary value problem
p. 1966-1973
The correctness of a time-optimality problem
p. 1974-1980
Stability of the solutions of differential equations with impulsive action
p. 1981-1992
On the theory of a class of nonlinear partial differential equations
p. 1993-2008
A mathematical discussion of some problems connected with the theory of longitudinal shock along finite rods
p. 2009-2025
Singularities of the solution of the Dirichlet problem for a second order elliptic equation in the neighborhood of an edge
p. 2026-2032
Some relations for the eigenvalues of discrete operators. Trace formulas for partial differential operators
p. 2033-2042
A boundary value problem for the wave equation
p. 2043-2050
A class of singular integral equations with involution, and its applications to the theory of boundary value problems for partial differential equations.~II
p. 2051-2062
The stable initial manifold for an integro-differential equation in the critical case
p. 2063-2069
Normally solvable and controllable correspondences
p. 2070-2075
A family of nonlinear difference schemes
p. 2076-2078
Equilibrium surfaces in a magnetic field
p. 2079-2081
Sufficient conditions for the solvability of a certain boundary value problem
p. 2082-2083
Asymptotic integration of block $L$-diagonal systems
p. 2084-2087
The existence of a solution with small growth for biregular differential systems with random perturbation
p. 2088-2092
The disconjugacy of a second order linear difference equation
p. 2093-2095
The admissibility of certain pairs of spaces for integral operators and Volterra equations
p. 2096-2098
On the question of the structural stability of linear systems of differential equations with almost periodic coefficients
p. 2099-2101
Iosif Zaharovi{\v{c}} Štokalo (on the occasion of his eightieth birthday)
p. 2102-2104

Sommaire du Fascicule no. 12

Invertibility conditions for a second order differential operator
p. 2115-2123
An optimal control problem in Hilbert space
p. 2124-2134
The structure of the Poincar\'e disc of a first order homogeneous differential equation
p. 2135-2140
On the question of the oscillation of the solutions of a second order differential equation with an ``integrally small'' coefficient
p. 2141-2148
The first boundary value problem for a certain fourth order system
p. 2149-2157
The solvability of linear differential equations in weighted spaces of entire functions
p. 2158-2167
Estimation of the states of controllable systems under conditions of indeterminacy
p. 2168-2179
A H\"older condition for Bellman's function
p. 2180-2187
The asymptotic properties of the solutions of two-dimensional differential systems
p. 2188-2198
On the question of the controllability of linear systems in locally convex spaces
p. 2199-2206
Semi-dynamical systems on the line
p. 2207-2212
$(U,\kappa ,\alpha )$-monotone equations
p. 2213-2224
On the question of the stability of the solutions of linear differential equations with retarded argument
p. 2225-2233
The Goursat problem for a second order hyperbolic equation with a singularity in the coefficient
p. 2234-2245
Method of penalty functions and optimality conditions for the generalized solutions for an optimal control problem with partial derivatives
p. 2246-2255
Stabilization of the solution of the Cauchy problem for a higher order parabolic equation
p. 2256-2264
The inverse problem for higher order elliptic equations
p. 2265-2271
Syzygies between the affine invariants of a system with quadratic right hand sides
p. 2272-2275
Optimal control of processes that are described by integro-differential equations
p. 2276-2279
Boris Pavlovi{\v{c}} Demidovi{\v{c}}
p. 2280-2283
Isaak Samo{\v\i}lovi{\v{c}} Kukles
p. 2284-2287
Letter to the editors: ``A criterion for discreteness of the spectrum for a degenerate operator, and certain imbedding theorems'' (Differencial'nye Uravnenija \textbf{13} (1977), no.~1, 111--120)