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  • 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 ...
  • On Samuelson Submanifolds in Four Space 
    Cooper, J.B.; Russell, T. (2009)
    The object of study in this talk is a general class of submanifolds of R^4. The motivation for this work was the derivation of the following equation which answered a question posed by the distinguished economist P.A. Samuelson.
  • On scalar-type spectral operators and Carleman ultradifferentiable C₀-semigroups 
    Markin, M.V. (Український математичний журнал, 2008)
    Necessary and sufficient conditions for a scalar-type spectral operator in a Banach space to be a generator of a Carleman ultradifferentiable C₀-semigroup are found. The conditions are formulated exclusively in terms of ...
  • On schurity of one-sided bimodule problems 
    Babych, V.; Golovashchuk, N. (Algebra and Discrete Mathematics, 2019)
    We consider a class of normal bimodule problems satisfying some structure, triangularity and finiteness conditions (one-sided bimodule problems). We study the structure of non-schurian bimodule problems from our class and ...
  • On semilinear equations in the complex plane 
    Gutlyanskiĭ, V.Ya.; Nesmelova, O.V.; Ryazanov, V.I. (Доповіді НАН України, 2019)
    We study the Dirichlet problem for the semilinear partial differential equations div (A∇u) = f (u) in simply connected domains D of the complex plane C with continuous boundary data. We prove the existence of the weak ...
  • On semisimple algebra codes: generator theory 
    Martınez-Moro, E. (Algebra and Discrete Mathematics, 2007)
    The class of affine variety codes is defined as the Fq linear subspaces of A a Fq-semisimple algebra, where Fq is the finite field with q=pr elements and characteristic p. It seems natural to impose to the code some extra ...
  • On separable and H-separable polynomials in skew polynomial rings of several variables 
    Ikehata, S. (Algebra and Discrete Mathematics, 2010)
    Let B be a ring with 1, and {ρ1,⋯,ρe} a set of automorphisms of B. Let B[X1,⋯,Xe;ρ1,⋯,ρe;{uij}] be the skew polynomial ring of automorphism type. In this paper, we shall give equivalent conditions that the residue ring of ...
  • On separable group rings 
    Szeto, G.; Lianyong Xue (Algebra and Discrete Mathematics, 2010)
    Let G be a finite non-abelian group, R a ring with 1, and Ĝ the inner automorphism group of the group ring RG over R induced by the elements of G. Then three main results are shown for the separable group ring RG over R: ...
  • On separation of vacuum volumes on the path of an electron beam 
    Kasilov, V.I.; Buki, A.Yu. (Вопросы атомной науки и техники, 2009)
    The problem of separation by a thin foil of vacuum volumes located on the path of an electron beam is considered. It is shown that in the case of the 300 MeV electron LINAC being under reconstruction, the vacuum separation ...
  • On sequences of Mealy automata and their limits 
    Reznykov, I.I. (Algebra and Discrete Mathematics, 2006)
    We introduce the notions of n-state Mealy automaton sequence and limit of this sequence. These notions are illustrated by the 2-state Mealy automaton sequences that have the set of finite limit automata.
  • On Sets with Extremely Big Slices 
    Ivakhno, Ye. (Журнал математической физики, анализа, геометрии, 2006)
    A new characterization of the Radon-Nikodym property in terms of sizes of slices and equivalent norms is presented. A property opposite to the Radon-Nikodym property is studied in the context of 1-unconditional sums of ...
  • On sexual dimorphism in Xiphobates callipygis (Oribatei, Ceratozetoidea, Chamobatidae) 
    Pavlitshenko, P.G. (Вестник зоологии, 1994)
  • On simple groups of large exponents 
    Sonkin, D. (Algebra and Discrete Mathematics, 2004)
    It is shown that the set of pairwise non-isomorphic 2-generated simple groups of exponent n (n ≥ 2⁴⁸ and n is odd or divisible by 2⁹ ) is of cardinality continuum. As a corollary, for any sufficiently large n the ...
  • On simulation of spatial-temporal chaos: The simplest mathematical patterns and computer graphics 
    Romanenko, Ye.Yu.; Vereikina, M.B. (Український математичний журнал, 1993)
    The article presents three scenarios of the evolution of spatial-temporal chaos and specifies the corresponding types of chaotic solutions to a certain nonlinear boundary-value problem for PDE. Analytic assertions are ...
  • On single-mode equilibrium and self-organization of reversal field pinch 
    Gurin, A.A. (Вопросы атомной науки и техники, 2011)
    The MGD self-stabilization of kink instability of paramagnetic z-pinch with strong current and some features of the RFP-like quasi-single-mode self-organization as a result of plasma azimuth and z-convection generated by ...
  • On single-time methods in relativistic gravity dynamics 
    Opanasyuk, Yu.A. (Condensed Matter Physics, 1998)
    A short outline of revived methods of an action-at-a-distance description of interacting particles is given. A new approach to the problem of motion in relativistic gravity is discussed. The approach makes an essential ...