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Found 75 Documents (Results 1–75)

A variational method of solving boundary value problems for ordinary differential equations. (English. Russian original) Zbl 0770.34020

Sov. Math., Dokl. 43, No. 2, 572-575 (1991); translation from Dokl. Akad. Nauk SSSR 317, No. 5, 1037-1041 (1991).
Reviewer: M.Goebel (Halle)
MSC:  34B15
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Extremal selections of multivalued mappings and the ”bang-bang” principle for evolution inclusions. (English. Russian original) Zbl 0784.54024

Sov. Math., Dokl. 43, No. 2, 481-485 (1991); translation from Dokl. Akad. Nauk SSSR 317, No. 3, 589-593 (1991).
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On the first boundary value problem for a direct-inverse parabolic equation. (English. Russian original) Zbl 0782.35083

Sov. Math., Dokl. 43, No. 2, 476-480 (1991); translation from Dokl. Akad. Nauk SSSR 317, No. 3, 584-588 (1991).
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Spectral problems for the Sturm-Liouville equation with a parameter. Geometry of finite-gap potentials. (English. Russian original) Zbl 0791.34065

Sov. Math., Dokl. 43, No. 2, 439-444 (1991); translation from Dokl. Akad. Nauk SSSR 317, No. 3, 550-554 (1991).
Reviewer: Y.P.Mishev (Sofia)
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Trace formulas for a differential equation of even order with unbounded operator coefficient. (English. Russian original) Zbl 0765.34059

Sov. Math., Dokl. 43, No. 2, 406-410 (1991); translation from Dokl. Akad. Nauk SSSR 317, No. 3, 521-525 (1991).
MSC:  34L05 47E05 47A75
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A fast iterative method for solving in real arithmetic a system of linear equations with a complex symmetric matrix. (English. Russian original) Zbl 0778.65022

Sov. Math., Dokl. 43, No. 2, 377-379 (1991); translation from Dokl. Akad. Nauk SSSR 317, No. 2, 294-296 (1991).
MSC:  65F10 65E05
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On the behavior of the spectrum of certain linear multipoint boundary value problems for ordinary differential equations. (English. Russian original) Zbl 0778.34064

Sov. Math., Dokl. 43, No. 2, 342-344 (1991); translation from Dokl. Akad. Nauk SSSR 317, No. 2, 265-266 (1991).
MSC:  34L15 34B10
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On a formula for the asymptotic expansion of an integral in complex analysis. (English. Russian original) Zbl 0753.30027

Sov. Math., Dokl. 43, No. 2, 624-627 (1991); translation from Dokl. Akad. Nauk SSSR 317, No. 6, 1311-1314 (1991).
Reviewer: J.Chrastina (Brno)
MSC:  30E15 41A60
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On integral operators on the cone of monotone functions, and on imbeddings of Lorentz spaces. (English. Russian original) Zbl 0749.46016

Sov. Math., Dokl. 43, No. 2, 620-623 (1991); translation from Dokl. Akad. Nauk SSSR 317, No. 6, 1308-1311 (1991).
MSC:  46E30 47B38 47G10
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The theory of semimodules of infrasemiunits in ideal spaces of vector- valued functions, and its applications to integral operators. (English. Russian original) Zbl 0752.46020

Sov. Math., Dokl. 43, No. 2, 615-619 (1991); translation from Dokl. Akad. Nauk SSSR 317, No. 6, 1303-1307 (1991).
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An optimal control problem for systems with deviating argument, and its connection with the finitely generated group of homeomorphisms of \(R\) generated by the deviation functions. (English. Russian original) Zbl 0752.34042

Sov. Math., Dokl. 43, No. 2, 600-605 (1991); translation from Dokl. Akad. Nauk SSSR 317, No. 6, 1289-1294 (1991).
MSC:  34K35 49K27
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Problems of Bitsadze-Samarskij type for an equation of mixed type. (English. Russian original) Zbl 0781.35041

Sov. Math., Dokl. 43, No. 2, 595-599 (1991); translation from Dokl. Akad. Nauk SSSR 317, No. 5, 1058-1061 (1991).
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On the solution of a problem in the theory of the Frankl’ problem for equations of mixed type. (English. Russian original) Zbl 0781.35039

Sov. Math., Dokl. 43, No. 2, 584-588 (1991); translation from Dokl. Akad. Nauk SSSR 317, No. 5, 1048-1052 (1991).
MSC:  35M10
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On a method of regularization of boundary value problems for differential equations with deviating argument. (English. Russian original) Zbl 0752.34036

Sov. Math., Dokl. 43, No. 2, 567-571 (1991); translation from Dokl. Akad. Nauk SSSR 317, No. 5, 1033-1037 (1991).
MSC:  34K10 34K05
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A difference approximation of a singularly perturbed quasilinear elliptic equation degenerating into a first-order equation. (English. Russian original) Zbl 0773.35022

Sov. Math., Dokl. 43, No. 2, 562-566 (1991); translation from Dokl. Akad. Nauk SSSR 317, No. 4, 845-849 (1991).
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Application of invariant processes to the study of homogeneous linear partial integrals of a differential system. (English. Russian original) Zbl 0755.34008

Sov. Math., Dokl. 43, No. 2, 550-555 (1991); translation from Dokl. Akad. Nauk SSSR 317, No. 4, 834-839 (1991).
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A continuous function whose graph intersects the graph of each polynomial in a set of cardinality of the continuum. (English. Russian original) Zbl 0754.26002

Sov. Math., Dokl. 43, No. 2, 540-542 (1991); translation from Dokl. Akad. Nauk SSSR 317, No. 4, 826-828 (1991).
Reviewer: J.Chrastina (Brno)
MSC:  26A30
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A linear junction problem for solutions of elliptic systems of differential equations with singular coefficients in the plane. (English. Russian original) Zbl 0776.35049

Sov. Math., Dokl. 43, No. 2, 525-530 (1991); translation from Dokl. Akad. Nauk SSSR 317, No. 4, 813-818 (1991).
MSC:  35Q15 30E25 45F15
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The mean \(\varepsilon{}\)-dimension of function classes with spectra contained in a given set. (English. Russian original) Zbl 0782.46027

Sov. Math., Dokl. 43, No. 2, 514-518 (1991); translation from Dokl. Akad. Nauk SSSR 317, No. 4, 803-807 (1991).
MSC:  46E30 41A46 54F45
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Asymptotic behavior of the energy for an integro-differential equation describing acoustic waves in a relaxation medium. (English. Russian original) Zbl 0752.45019

Sov. Math., Dokl. 43, No. 2, 503-507 (1991); translation from Dokl. Akad. Nauk SSSR 317, No. 4, 792-797 (1991).
MSC:  45K05 45M05
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Best-possible estimates of solutions of the Dirichlet problem for linear elliptic nondivergence equations of second order in a domain with a conical point. (English. Russian original) Zbl 0762.35028

Sov. Math., Dokl. 43, No. 2, 500-502 (1991); translation from Dokl. Akad. Nauk SSSR 317, No. 4, 790-792 (1991).
MSC:  35J25 35B45
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On regularization of the trace of a higher-order differential operator with a bounded operator coefficient. (English. Russian original) Zbl 0754.34083

Sov. Math., Dokl. 43, No. 2, 486-491 (1991); translation from Dokl. Akad. Nauk SSSR 317, No. 4, 777-781 (1991).
MSC:  34L05 47E05 47A75
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Uniform convexity and local uniform convexity of symmetric spaces of measurable operators. (English. Russian original) Zbl 0780.46036

Sov. Math., Dokl. 43, No. 2, 445-448 (1991); translation from Dokl. Akad. Nauk SSSR 317, No. 1, 555-558 (1991).
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On the solvability of boundary value problems of electromagneto- elasticity with memory. (English. Russian original) Zbl 0751.73050

Sov. Math., Dokl. 43, No. 2, 329-333 (1991); translation from Dokl. Akad. Nauk SSSR 317, No. 1, 35-39 (1991).
MSC:  74F15 35Q72
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On solutions of systems of nonlinear two-dimensional Volterra integral equations of the first kind. (English. Russian original) Zbl 0753.45006

Sov. Math., Dokl. 43, No. 2, 325-328 (1991); translation from Dokl. Akad. Nauk SSSR 317, No. 1, 32-35 (1991).
MSC:  45G15 45D05 45L05
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On equiconvergence with a trigonometric series of expansions in root functions of the Schrödinger operator with an arbitrary summable complex-valued potential. (English. Russian original) Zbl 0749.34049

Sov. Math., Dokl. 43, No. 2, 320-324 (1991); translation from Dokl. Akad. Nauk SSSR 317, No. 1, 27-31 (1991).
MSC:  34L40 34L10
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New generalized functions and weak well-posedness of operator problems. (English. Russian original) Zbl 0752.35081

Sov. Math., Dokl. 43, No. 2, 315-319 (1991); translation from Dokl. Akad. Nauk SSSR 317, No. 1, 22-26 (1991).
Reviewer: A.Neubauer (Linz)
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