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  • 1.
    Buchukuri, Tengiz
    et al.
    A. Razmadze Mathematical Institute, Tbilisi State University.
    Dudachava, Roland
    A. Razmadze Mathematical Institute, Tbilisi State University.
    Tephnadze, George
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mathematical Science.
    Laplace–Beltrami equation on hypersurfaces and Γ-convergence2017In: Mathematical methods in the applied sciences, ISSN 0170-4214, E-ISSN 1099-1476, Vol. 40, no 13, p. 4637-4657Article in journal (Refereed)
    Abstract [en]

    A mixed boundary value problem for the stationary heat transfer equation in a thin layer around a surface C with the boundary is investigated. The main objective is to trace what happens in Γ-limit when the thickness of the layer converges to zero. The limit Dirichlet BVP for the Laplace–Beltrami equation on the surface is described explicitly, and we show how the Neumann boundary conditions in the initial BVP transform in the Γ-limit. For this, we apply the variational formulation and the calculus of Günter's tangential differential operators on a hypersurface and layers, which allow global representation of basic differential operators and of corresponding boundary value problems in terms of the standard Euclidean coordinates of the ambient space Rn.

  • 2.
    Euler, Marianna
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mathematical Science.
    Euler, Norbert
    Strömberg, Anders
    Luleå tekniska universitet.
    Åström, Erik
    Luleå tekniska universitet.
    Transformation between a generalized Emden-Fowler equation and the first Painlevé transcendent2007In: Mathematical methods in the applied sciences, ISSN 0170-4214, E-ISSN 1099-1476, Vol. 30, no 16, p. 2121-2124Article in journal (Refereed)
    Abstract [en]

    We use the generalized Sundman transformation to obtain a relation between a generalized Emden-Fowler equation and the first Painlevé transcendent.

  • 3.
    Lukkassen, Dag
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mathematical Science.
    Meidell, A.
    Narvik University College, 8505 Narvik, Norway.
    Persson, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mathematical Science.
    Samko, Natasha
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mathematical Science.
    Hardy and singular operators in weighted generalized Morrey spaces with applications to singular integral equations2012In: Mathematical methods in the applied sciences, ISSN 0170-4214, E-ISSN 1099-1476, Vol. 35, no 11, p. 1300-1311Article in journal (Refereed)
    Abstract [en]

    We study the weighted boundedness of the multi-dimensional Hardy-type and singular operators in the generalized Morrey spaces L p,Ψ(ℝ n,w), defined by an almost increasing function Ψ(r) and radial type weights. We obtain sufficient conditions, in terms of numerical characteristics, that is, index numbers of the weight functions and the function Ψ. In relation with the wide usage of singular integral equations in applications, we show how the solvability of such equations in the generalized Morrey spaces depends on the main characteristics of the space, which allows to better control both the singularities and regularity of solutions

  • 4.
    Lundberg, Staffan
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mathematical Science.
    Samko, Natasha
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mathematical Science.
    On some hyperbolic type equations and weighted anisotropic Hardy operators2017In: Mathematical methods in the applied sciences, ISSN 0170-4214, E-ISSN 1099-1476, Vol. 40, no 5, p. 1414-1421Article in journal (Refereed)
    Abstract [en]

    We introduce a version of weighted anisotropic Morrey spaces and anisotropic Hardy operators. We find conditions for boundedness of these operators in such spaces. We also reveal the role of these operators in solving some classes of degenerate hyperbolic partial differential equations.

1 - 4 of 4
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