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Перегляд Відділення математики за назвою

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Перегляд Відділення математики за назвою

Сортувати за: Порядок: Результатів:

  • A 2+1-Dimensional Non-Isothermal Magnetogasdynamic System. Hamiltonian-Ermakov Integrable Reduction 
    An, H.; Rogers, C. (Symmetry, Integrability and Geometry: Methods and Applications, 2012)
    A 2+1-dimensional anisentropic magnetogasdynamic system with a polytropic gas law is shown to admit an integrable elliptic vortex reduction when γ=2 to a nonlinear dynamical subsystem with underlying integrable Hamiltonian-Ermakov ...
  • A 2-generated 2-related group with no non-trivial finite quotients 
    Ol’shanskii, A.Yu.; Sapir, M.V. (Algebra and Discrete Mathematics, 2007)
    We construct a 2-generated 2-related group without non-trivial finite factors-groups. This answers a question of J. Button.
  • A Banach Principle for Semifinite von Neumann Algebras 
    Chilin, V.; Litvinov, S. (Symmetry, Integrability and Geometry: Methods and Applications, 2006)
    Utilizing the notion of uniform equicontinuity for sequences of functions with the values in the space of measurable operators, we present a non-commutative version of the Banach Principle for L∞.
  • Abelian-by-FC-hypercentral groups 
    Tomkinson, M.J. (Український математичний журнал, 1991)
    A splitting Theorem for FC-hypercentral group G and ZG-module of finite rank is obtained. According to this Theorem, under certain conditions, every extention E of the ZG-module A by the group G is split and all the ...
  • Abelian doppelsemigroups 
    Zhuchok, A.V.; Knauer, K. (Algebra and Discrete Mathematics, 2018)
    A doppelsemigroup is an algebraic system consisting of a set with two binary associative operations satisfying certain identities. Doppelsemigroups are a generalization of semigroups and they have relationships with such ...
  • Abnormal subgroups and Carter subgroups in some infinite groups 
    Kurdachenko, L.A.; Subbotin, I.Ya. (Algebra and Discrete Mathematics, 2005)
    t. Some properties of abnormal subgroups in generalized soluble groups are considered. In particular, the transitivity of abnormality in metahypercentral groups is proven. Also it is proven that a subgroup H of a radical ...
  • A Bochner Theorem for Dunkl Polynomials 
    Vinet, L.; Zhedanov, A. (Symmetry, Integrability and Geometry: Methods and Applications, 2011)
    We establish an analogue of the Bochner theorem for first order operators of Dunkl type, that is we classify all such operators having polynomial solutions. Under natural conditions it is seen that the only families of ...
  • About bounded properties of smooth solutions of some differential-operator equations 
    Gorodetsky, V.V.; Drin, I.I. (Нелинейные граничные задачи, 1999)
  • About one characteristic initial value problem 
    Marinets, V.V.; Dobryden, A.V. (Нелінійні коливання, 2001)
    The characteristic initial value problem has been studied for the second order nonlinear differential equation, and modifications of the two-sided method of its approximate integration have been constructed.
  • About one extremal problem for open sets and partially non-overlapping domains 
    Targonskii, A.L.; Targonskaya, I.I.; Vashenko, K. (Український математичний вісник, 2019)
    Sharp estimates of a product of the inner radii for pairwise disjoint domains are obtained. In particular, we solve an extremal problem in the case of any finite number of free poles on the rays.
  • About one extremal problem for projections of the points on unit circle 
    Targonskii, A.L. (Український математичний вісник, 2018)
    Sharp estimates of a product of inner radii for pairwise disjoint domains are obtained. In particular, the extremal problem in the case of any finite number of free poles at the points on rays is solved.
  • About one modulus inequality of the order p ≥ 1 
    Salimov, R.R.; Sevost'yanov, E.A. (Труды Института прикладной математики и механики, 2012)
    The present paper is devoted to the study of space mappings which are more general than quasiregular. The so-called modulus inequalities of the order p, p ≥ 1, and it’s connections with space mappings are investigated. The ...
  • About *-Representations of Polynomial Semilinear Relations 
    Omel'chenko, P.V. (2009)
    In the present paper we study *-representations of semilinear relations with polynomial characteristic functions. For any finite simple non-oriented graph Г we construct a polynomial characteristic function such that Г is ...
  • About some mappings in λ(r) -regular metric spaces 
    Salimov, R.; Afanas'eva, O. (Труды Института прикладной математики и механики, 2013)
    It is formulated conditions on functions Q(x) and boundaries of domains under which every Q-homeomorphism admits continuous or homeomorphic extension to the boundary in metric spaces with measures.
  • About the boundedness of 3-D continuous-time quadratic systems 
    Elhadj, Z.; Sprott, J.C. (Нелінійні коливання, 2010)
    Наведено узагальнення всiх вiдомих результатiв про верхню границю для загальної 3-D квадратичної системи з неперервним часом. Зокрема, знайдено великi областi у просторi бiфуркацiйного параметра системи, де система є обмеженою.
  • About the spectra of a real nonnegative matrix and its signings 
    Attas, K.; Boussaïri, A.; Zaidi, M. (Algebra and Discrete Mathematics, 2021)
    For a complex matrix M, we denote by Sp(M) the spectrum of M and by |M| its absolute value, that is the matrix obtained from M by replacing each entry of M by its absolute value. Let A be a nonnegative real matrix, we call ...
  • About Twistor Spinors with Zero in Lorentzian Geometry 
    Leitner, F. (Symmetry, Integrability and Geometry: Methods and Applications, 2009)
    We describe the local conformal geometry of a Lorentzian spin manifold (M,g) admitting a twistor spinor φ with zero. Moreover, we describe the shape of the zero set of φ. If φ has isolated zeros then the metric g is locally ...
  • Absolutely ubiquitous groups 
    Ivanov, A.; Majcher, K. (Algebra and Discrete Mathematics, 2006)
    We characterise absolutely ubiquitous groups in the class of model complete ω-categorical groups.
  • Abstracts 
    Автор відсутній (Український математичний вісник, 2018)
  • Abstracts 
    Автор відсутній (Український математичний вісник, 2017)

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