Перегляд за назвою

Сортувати за: Порядок: Результатів:

  • On recurrence in G-spaces 
    Protasov, I.V.; Protasova, K.D. (Algebra and Discrete Mathematics, 2017)
    We introduce and analyze the following general concept of recurrence. Let G be a group and let X be a G-space with the action G×X⟶X, (g,x)⟼gx. For a family F of subset of X and A∈F, we denote ΔF(A)={g∈G:gB⊆A for some B∈F, ...
  • On reduction of results of joint astronomical, geodetic, and geophysical observations to one geometrical centre 
    Tyshchuk, M.; Gozhy, A. (Кинематика и физика небесных тел, 2005)
    There are tasks, for which decision it is necessary to determine small temporal changes of various astronomical, geodetic and geophysical parameters in any epoch in the same place and to reduce results of measurements to ...
  • On Reductions of the Hirota-Miwa Equation 
    Hone, A.N.W.; Kouloukas, T.E.; Ward, C. (Symmetry, Integrability and Geometry: Methods and Applications, 2017)
    The Hirota-Miwa equation (also known as the discrete KP equation, or the octahedron recurrence) is a bilinear partial difference equation in three independent variables. It is integrable in the sense that it arises as the ...
  • On regular geons in general relativity 
    Olyeynik, V.P. (Вопросы атомной науки и техники, 2012)
    We present the exact regular solution of vacuum Einstein equations, which may be interpreted as "mass without mass'' (geon – in terminology of J.A. Wheeler), moving along a straight line with constant velocity. The feature ...
  • On Regularized Solution for BBGKY Hierarchy of One-Dimensional Infinite System 
    Ryabukha, T.V. (Symmetry, Integrability and Geometry: Methods and Applications, 2006)
    We construct a regularized cumulant (semi-invariant) representation of a solution of the initial value problem for the BBGKY hierarchy for a one-dimensional infinite system of hard spheres interacting via a short-range ...
  • On regular torsionless S-posets 
    Khosravi, R. (Algebra and Discrete Mathematics, 2018)
    This paper shall be concerned with the notion of regular torsionless in the category of S-posets. Besides elementary basic properties of regular torsionless S-posets, we consider cyclic regular torsionless S-posets and ...
  • On relation between the autoemitter top field, anode voltage and cathode geometry 
    Stetsenko, B.V.; Shchurenko, A.I. (Вопросы атомной науки и техники, 2009)
    A field emission diode has been made up on the basis of a flat metal anode and pin cathode (of the height a) that is mounted on a flat metal plate parallel to the anode. The potential of the field emission diode has been ...
  • On relativistic effects on electron transport in the banana regime in tokamaks 
    Marushchenko, I.; Azarenkov, N.A. (Вопросы атомной науки и техники, 2019)
    In the present work, the neoclassical transport theory in tokamaks is re-considered with the relativistic effects for electrons taken into account. Since such effects are important only in high-temperature plasmas, only ...
  • On relativistic models in the equilibrium statistical mechanics 
    Tretyak, V. (Condensed Matter Physics, 1998)
    Relativistic effects in the thermodynamical properties of interacting particle systems are investigated within the framework of the relativistic direct interaction theory in various forms of dynamics. In the front form ...
  • On relaxation phenomena in a two-component plasma 
    Gorev, V.N.; Sokolovsky, A.I.; Chelbaevsky, Z.Yu. (Condensed Matter Physics, 2015)
    The relaxation of the temperatures and velocities of the components of a quasi-equilibrium two-component homogeneous completely ionized plasma is investigated on the basis of a generalization of the Chapman--Enskog method ...
  • On reliability modeling and evaluating in cloud services system 
    Telenyk, S.F.; Savchuk, O.V.; Pokrovskyi, E.O.; Morgal, O.M.; Pokhylenko, O.A. (Штучний інтелект, 2018)
    A typical system of reliability of cloud services with a cloud management system is explored. The proposed model is service-oriented and hierarchical. It includes two phases of query maintenance: 1) time-out and overflow; ...
  • On removable sets for degenerated elliptic equations 
    Gadjiev, T.S.; Bayramova, N.Q. (Український математичний журнал, 2014)
    We establish necessary and sufficient conditions of removability of compact sets.
  • On representations of a general solution in the theory of micropolar thermoelasticity without energy dissipation 
    Giordano, P.; Svanadze, M.; Zampoli, V. (Український математичний журнал, 2007)
    In the present paper, the linear theory of micropolar thermoelasticity without energy dissipation is considered. This work is organized as follows: Section 2 is devoted to basic equations for micropolar thermoelastic ...
  • On representations of permutations groups as isometry groups of n-semimetric spaces 
    Gerdiy, O.; Oliynyk, B. (Algebra and Discrete Mathematics, 2015)
    We prove that every finite permutation group can be represented as the isometry group of some n-semimetric space. We show that if a finite permutation group can be realized as the isometry group of some n-semimetric ...
  • On representations of the group of order two over local factorial rings in the weakly modular case 
    Bondarenko, V.M.; Stoika, M. (Algebra and Discrete Mathematics, 2017)
    We study representations of the group of order 2 over local factorial rings of characteristic not 2 with residue field of characteristic 2. The main results are related to a sufficient condition of wildness of groups.
  • On representations of the semigroups S(I,J) with acyclic quiver 
    Bondarenko, V.M.; Tertychna, O.M. (2009)
    In this paper we study representations of semigroups (over a field k) generated by idempotents with partial null multiplication in the case when the corresponding quiver has not oriented cycles.
  • On representation type of a pair of posets with involution 
    Bondarenko, V.M. (Algebra and Discrete Mathematics, 2005)
    In this paper we consider the problem on classifying the representations of a pair of posets with involution. We prove that if one of these is a chain of length at least 4 with trivial involution and the other is with ...
  • On reselling of European option 
    Kukush, A.G.; Mishura, Yu.S.; Shevchenko, G.M. (2006)
    On Black and Scholes market investor buys a European call option. At each moment of time till the maturity, he is allowed to resell the option for the quoted market price. A model is proposed, under which there is no ...
  • On rings with weakly prime centers 
    Junchao Wei (Український математичний журнал, 2014)
    We introduce a class of rings obtained as a generalization of rings with prime centers. A ring R is called weakly prime center (or simply WPC) if ab∈Z(R) (R) implies that aRb is an ideal of R where Z(R) stands for the ...
  • On Robust Feedback for Systems with Multidimensional Control 
    Korobov, V.I.; Revina, T.V. (Журнал математической физики, анализа, геометрии, 2017)
    The paper deals with local robust feedback synthesis problem for systems with multidimensional control and unknown bounded perturbations. Using V.I. Korobov's controllability function method, a bounded control which steers ...