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Found 1,304 Documents (Results 1–100)

Duality of nonlinear dynamical systems and synthesis of observers. (English. Russian original) Zbl 0976.93009

Differ. Equations 35, No. 5, 653-668 (1999); translation from Differ. Uravn. 35, No. 5, 649-663 (1999).
MSC:  93B07 93B05 93B29 93B50 93B10 93C10 93C35
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On the instability of an equilibrium with respect to the first approximation for a nonstationary nonlinear equation in a Hilbert space. (English. Russian original) Zbl 0972.34050

Differ. Equations 35, No. 6, 846-847 (1999); translation from Differ. Uravn. 35, No. 6, 840 (1999).
MSC:  34G20 34D30
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Coefficient estimates for global solutions of the Cauchy problem for semilinear systems of partial differential equations. (English. Russian original) Zbl 0972.35018

Differ. Equations 35, No. 7, 1011-1014 (1999); translation from Differ. Uravn. 35, No. 7, 1000-1002 (1999).
MSC:  35F25 35B45
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Limit theorems in the theory of periodic solutions of linear and quasilinear systems of difference equations. (English. Russian original) Zbl 0976.39007

Differ. Equations 35, No. 9, 1277-1285 (1999); translation from Differ. Uravn. 35, No. 9, 1262-1270 (1999).
MSC:  39A11 47J05
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Embeddability of nonlinear discrete equations with variable structure in linear systems. (English. Russian original) Zbl 0990.93067

Differ. Equations 35, No. 9, 1221-1229 (1999); translation from Differ. Uravn. 35, No. 9, 1207-1215 (1999).
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To the theory of two-point boundary value problems for second-order differential equations. (English. Russian original) Zbl 1006.34015

Differ. Equations 35, No. 10, 1391-1401 (1999); translation from Differ. Uravn. 35, No. 10, 1372-1381 (1999).
MSC:  34B15
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“Chase on ducks” in the investigation of singularity perturbed boundary value problems. (English. Russian original) Zbl 1064.34516

Differ. Equations 35, No. 10, 1374-1383 (1999); translation from Differ. Uravn. 35, No. 10, 1356-1365 (1999).
MSC:  34E20 34B15
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On a countable set of normalized eigenfunctions of a nonlinear periodic problem with transformed argument. (English. Russian original) Zbl 0988.34051

Differ. Equations 35, No. 10, 1353-1359 (1999); translation from Differ. Uravn. 35, No. 10, 1337-1342 (1999).
Reviewer: J.Diblík (Brno)
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Asymptotic expansion of the quasipotential for a stochastically perturbed nonlinear oscillator. (English. Russian original) Zbl 0993.34053

Differ. Equations 35, No. 10, 1334-1340 (1999); translation from Differ. Uravn. 35, No. 10, 1319-1324 (1999).
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Decomposition of three-dimensional nonlinear controlled systems. (English. Russian original) Zbl 0976.93013

Differ. Equations 35, No. 11, 1494-1502 (1999); translation from Differ. Uravn. 35, No. 11, 1473-1481 (1999).
MSC:  93B29 93B11 93B10 93C10
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The deviation of a functional from the optimal value under chattering exponentially decays as the number of switchings tends to infinity. (English. Russian original) Zbl 0986.49022

Differ. Equations 35, No. 11, 1489-1493 (1999); translation from Differ. Uravn. 35, No. 11, 1468-1472 (1999).
Reviewer: D.Silin (Berkeley)
MSC:  49N60 93C10
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Many-parameter solutions of the Tzitzéica equation. (English. Russian original) Zbl 0969.35009

Differ. Equations 35, No. 12, 1683-1692 (1999); translation from Differ. Uravn. 35, No. 12, 1660-1668 (1999).
MSC:  35A22 35C05 35L70
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A finite element method for fourth-order quasilinear degenerating elliptic equations. (English. Russian original) Zbl 0937.65115

Differ. Equations 35, No. 2, 233-238 (1999); translation from Differ. Uravn. 35, No. 2, 232-237 (1999).
MSC:  65N30 35J65 65N15
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A method for solving a nonlinear self-adjoint spectral problem for a second order ordinary differential equation with nonlocal boundary conditions. (English. Russian original) Zbl 0947.65093

Differ. Equations 35, No. 2, 205-210 (1999); translation from Differ. Uravn. 35, No. 2, 206-211 (1999).
MSC:  65L15 34L15
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The existence of a linear Pfaff system with disconnected lower characteristic set of positive measure. (English. Russian original) Zbl 0936.35035

Differ. Equations 35, No. 1, 64-70 (1999); translation from Differ. Uravn. 35, No. 1, 65-71 (1999).
MSC:  35B40 35Q58 35F20
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On fundamental solutions of the Cauchy problem for degenerate equations of the Kolmogorov type with \(2b\)-parabolic part with respect to the main group of variables. (English. Russian original) Zbl 0954.35009

Differ. Equations 34, No. 11, 1537-1546 (1998); translation from Differ. Uravn. 34, No. 11, 1536-1545 (1998).
MSC:  35A08 35G25 35K65
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Control of chaos in nonlinear dynamical systems. (English. Russian original) Zbl 0977.93036

Differ. Equations 34, No. 11, 1501-1509 (1998); translation from Differ. Uravn. 34, No. 11, 1501-1509 (1998).
MSC:  93C10 37D45 93D15
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The relation between the notions of \(C\)-system and \(L_1\)-system in the theory of affine control systems. (English. Russian original) Zbl 0991.93050

Differ. Equations 34, No. 11, 1471-1477 (1998); translation from Differ. Uravn. 34, No. 11, 1471-1477 (1998).
MSC:  93C10 93B10
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A method for proving the solvability of a problem of the nonlinear theory of shallow shells. (English. Russian original) Zbl 0958.35140

Differ. Equations 34, No. 10, 1412-1420 (1998); translation from Differ. Uravn. 34, No. 10, 1412-1419 (1998).
MSC:  35Q72 35D05 74B20 74K25
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A problem with free boundary for the Laplace equation, capillary-gravitational waves in space, bifurcation, and symmetry. (English. Russian original) Zbl 1098.35566

Differ. Equations 34, No. 8, 1104-1110 (1998); translation from Differ. Uravn. 34, No. 8, 1100-1106 (1998).
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An application of the method of boundary integral equations to finding boundary-layer asymptotics of the solution of a nonlinear singularly perturbed boundary value problem for the heat equation in a two-layer domain. (English. Russian original) Zbl 1029.35024

Differ. Equations 34, No. 9, 1200-1211 (1998); translation from Differ. Uravn. 34, No. 9, 1198-1209 (1998).
MSC:  35B25 35K20
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Blow-up of solutions of a hyperbolic system: The critical case. (English. Russian original) Zbl 1032.35126

Differ. Equations 34, No. 9, 1157-1163 (1998); translation from Differ. Uravn. 34, No. 9, 1155-1161 (1998).
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Lagrangian of the process of generation of the second harmonic of femtosecond light pulses. (English. Russian original) Zbl 0959.35155

Differ. Equations 34, No. 7, 997-999 (1998); translation from Differ. Uravn. 34, No. 7, 993-995 (1998).
MSC:  35Q55 78A60 35Q51
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Asymptotics of solutions of the generalized Kolmogorov-Petrovskij-Piskunov equation for large values of time. (English. Russian original) Zbl 1001.35025

Differ. Equations 34, No. 5, 669-682 (1998); translation from Differ. Uravn. 34, No. 5, 668-681 (1998).
MSC:  35F25 35B40 45K05
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Construction of first integrals and last multipliers for polynomial autonomous many-dimensional differential systems. (English. Russian original) Zbl 0974.34007

Differ. Equations 34, No. 4, 564-566 (1998); translation from Differ. Uravn. 34, No. 4, 562-564 (1998).
MSC:  34A25 34A34 34C30 34D08
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The absence of positive solutions of second-order nonlinear elliptic equations in conical domains. (English. Russian original) Zbl 0970.35045

Differ. Equations 34, No. 4, 532-539 (1998); translation from Differ. Uravn. 34, No. 4, 533-539 (1998).
MSC:  35J60 35B05 35P05 35R05 35A05
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The number of solutions for second-order boundary value problems with nonlinear asymptotics. (English. Russian original) Zbl 0974.34015

Differ. Equations 34, No. 4, 469-477 (1998); translation from Differ. Uravn. 34, No. 4, 471-479 (1998).
MSC:  34B15 34A34 34C11
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The existence of a minimal global attractor for the nonlinear wave equation with antidissipation in the domain and with dissipation on part of the boundary. (English. Russian original) Zbl 0947.35021

Differ. Equations 34, No. 3, 326-330 (1998); translation from Differ. Uravn. 34, No. 3, 326-330 (1998).
MSC:  35B41 35L70 35L20
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A hybrid method for constructing asymptotics for a nonlinear singularly perturbed Cauchy problem with rapidly oscillating conditionally periodic coefficients. (English. Russian original) Zbl 0951.34038

Differ. Equations 34, No. 3, 320-325 (1998); translation from Differ. Uravn. 34, No. 3, 320-325 (1998).
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An identification problem for a nonlinear Schrödinger equation. (English. Russian original) Zbl 0957.49006

Differ. Equations 33, No. 12, 1695-1702 (1997); translation from Differ. Uravn. 33, No. 12, 1691-1698 (1997).
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Nontrivial solutions of boundary value problems with strong nonlinearities. (English. Russian original) Zbl 0952.34050

Differ. Equations 33, No. 12, 1679-1685 (1997); translation from Differ. Uravn. 33, No. 12, 1676-1682 (1997).
MSC:  34G20 34B05
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On manifold of solutions of semilinear elliptic equations satisfying the Pokhozhaev identity. II. (English. Russian original) Zbl 0948.35046

Differ. Equations 33, No. 12, 1673-1678 (1997); translation from Differ. Uravn. 33, No. 12, 1670-1675 (1997).
MSC:  35J60 35B10 35B30
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The Harnack inequality and the Hölder property of solutions of nonlinear elliptic equations with a nonstandard growth condition. (English. Russian original) Zbl 0949.35048

Differ. Equations 33, No. 12, 1653-1663 (1997); translation from Differ. Uravn. 33, No. 12, 1651-1660 (1997).
MSC:  35J60 35B45 35B65
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