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Перегляд Український математичний вісник за назвою

Репозиторій DSpace/Manakin

Перегляд Український математичний вісник за назвою

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  • Tangent spaces to metric spaces and to their subspaces 
    Dovgoshey, O.A. (2008)
    We investigate tangent spaces and metric space valued derivatives at points of a general metric spaces. The conditions under which two different subspaces of the metric space have isometric tangent spaces in the common ...
  • The Beltrami equation and ring homeomorphisms 
    Ryazanov, V.; Srebro, U.; Yakubov, E. (Український математичний вісник, 2007)
    With the aid of results by Gehring, we introduce and study plane ring Q-homeomorphisms. This study is then applied in deriving general principles on the existence and uniqueness of homeomorphic ACL solutions to the Beltrami ...
  • The Beltrami equations and prime ends 
    Gutlyanskii, V.Y.; Ryazanov, V.I.; Yakubov, E. (Український математичний вісник, 2015)
    We first study the boundary behavior of ring Q-homeomorphisms in terms of Carath´eodory’s prime ends and then give criteria to the solvability of the Dirichlet problem for the degenerate Beltrami equation ∂f = μ∂f in ...
  • The Cauchy problem for degenerate parabolic equations with source and damping 
    Andreucci, D.; Tedeev, A.F.; Ughi, M. (Український математичний вісник, 2004)
    We prove optimal estimates for the decay of mass of solutions to the Cauchy problem for a wide class of quasilinear parabolic equations with damping terms. In the degenerate case, we also prove estimates for the finite ...
  • The Cauchy-Stieltjes integrals in the theory of analytic functions 
    Ryazanov, V.I. (Український математичний вісник, 2017)
    We study various Stieltjes integrals as Poisson–Stieltjes, conjugate Poisson–Stieltjes, Schwartz–Stieltjes and Cauchy–Stieltjes and prove theorems on the existence of their finite angular limits a.e. in terms of the ...
  • The fourth order of accuracy sequential type rational splitting of inhomogeneous evolution problem 
    Rogava, J.; Tsiklauri, M. (Український математичний вісник, 2009)
    In the present work symmetrized sequential type decomposition scheme of the fourth degree precision for the solution of inhomogeneous evolution problem is constructed. The fourth degree precision is reached by introducing ...
  • The transmission problem for quasi-linear elliptic second order equations in a conical domain 
    Borsuk, M. (Український математичний вісник, 2007)
    We investigate the behavior of weak solutions to the transmission problem for quasi-linear elliptic divergence second order equations in a neighborhood of the boundary conical point.
  • Tietze Extension Theorem for Ordered Fuzzy Gδ-extremally Disconnected Spaces 
    Roja, E.; Uma, M.K.; Balasubramanian, G. (Український математичний вісник, 2006)
    In this paper, a new class of fuzzy topological spaces called ordered fuzzy G -extremally disconnected spaces is introduced. Tietze extension theorem for ordered fuzzy Gδ-extremally disconnected spaces has been discussed ...
  • Topological aspects of Hurewicz tests for the difference hierarchy 
    Matrai, T. (Український математичний вісник, 2006)
    We generalize the Baire Category Theorem to the Borel and difference hierarchies, i.e. if Г is any of the classes Σξ⁰, Пξ⁰, Dη(Σξ⁰) or Ďη(Σξ⁰) we find a representative set Pг ∊ Г and a Polish topology τг such that for every ...
  • To the spectral theory of the Bessel operator on finite interval and half-line 
    Ananieva, A.Yu.; Budyika, V.S. (Український математичний вісник, 2015)
    The minimal and maximal operators generated by the Bessel differential expression on the finite interval and a half-line are studied. All non-negative self-adjoint extensions of the minimal operator are described. Also we ...
  • To the theory of semi-linear equations in the plane 
    Gutlyanskii, V.Ya.; Nesmelova, O.V.; Ryazanov, V.I. (Український математичний вісник, 2019)
    In two dimensions, we present a new approach to the study of the semilinear equations of the form div[A(z)∇u] = f(u), the diffusion term of which is the divergence uniform elliptic operator with measurable matrix functions ...
  • Twisted K-theory 
    Atiyah, M.; Segal, G. (Український математичний вісник, 2004)
    Twisted complex K-theory can be defined for a space X equipped with a bundle of complex projective spaces, or, equivalently, with a bundle of C*-algebras. Up to equivalence, the twisting corresponds to an element of H³(X; ...
  • Uniqueness and topological properties of number representation 
    Dovgoshey, O.; Martio, O.; Ryazanov, V.; Vuorinen, M. (Український математичний вісник, 2004)
    Let b be a complex number with |b| > 1 and let D be a finite subset of the complex plane C such that 0 ∊ D and card D ≥ 2. A number z is representable by the system (D, b) if z = Σajbj , where aj ∊ D. We denote by F the ...
  • Uniqueness of spaces pretangent to metric spaces at infinity 
    Dovgoshey, O.; Bilet, V. (Український математичний вісник, 2019)
    We find the necessary and sufficient conditions under which an unbounded metric space X has, at infinity, a unique pretangent space Ωˣ∞, ř for every scaling sequence ř. In particular, it is proved that Ωˣ∞, ř is unique and ...
  • Upper bounds on second order operators, acting on metric function 
    Antoniouk, A.V. (Український математичний вісник, 2007)
    We prove upper bounds on the general second order operator acting on metric function. The suggested approach does not use traditional formulas for deviations of geodesics and Jacobi fields construction and leads to the ...
  • Vanishing Viscosity Method and Diffusion Processes 
    Belopolskaya, Ya. (Український математичний вісник, 2005)
    We construct diffusion processes associated with nonlinear parabolic equations and study their behavior as the viscosity (diffusion) coefficients go to zero. It allows to construct regularizations for solutions to hyperbolic ...
  • Weak solutions to one initial-boundary value problem with three boundary conditions for quasilinear evolution equations of the third order 
    Faminskii, A.V.; Bashlykova, I.Yu. (Український математичний вісник, 2008)
    Global well-posedness in a class of weak solutions is established to one initial-boundary value problem with three boundary conditions for a wide class of quasilinear dispersive evolution equations of the third order in ...
  • Weighted sharp inequality for vector-valued multilinear commutator of strongly singular integral operator 
    Zhang, H.; Cai, H. (Український математичний вісник, 2008)
    In this paper, a sharp inequality for the vector-valued multilinear commutator of strongly singular integral operator are obtained. By using this inequality, we prove the weighted Lp-norm inequality for the multilinear commutator.
  • Wiener criterion for relaxed Dirichlet problem relative to Riemannian p-homogeneous Dirichlet forms 
    Biroli, M.; Dal Fabbro, F.; Marchi, S. (Український математичний вісник, 2008)
    We give a Wiener criterion for the relaxed Dirichlet problem relative to a Riemannian p-homogeneous Dirichlet form.
  • Абстрактная формула Грина для тройки гильбертовых пространств, абстрактные краевые и спектральные задачи 
    Копачевский, Н.Д.; Крейн, С.Г. (Український математичний вісник, 2004)
    Для тройки гильбертовых пространств, определенным образом взаимосвязанных между собой, а также абстрактного оператора следа выводится абстрактная формула Грина, обобщающая известную формулу Грина для оператора Лапласа. На ...

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