Browsing 2. Articole by Issue Date

Browsing 2. Articole by Issue Date

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  • SINGULAR PERTURBATIONS OFHYPERBOLIC-PARABOLIC TYPE 
    Perjan, Andrei (Institutul de Matematică şi Informatică al AŞM, 2003)
    We study the behavior of solutions of the problemεu′′(t)+u′(t)+Au(t) =f(t), u(0) =u0, u′(0) =u1in the Hilbert spaceHasε→0, whereAis a linear,symmetric, strong positive operator.
  • ERGODIC SETS AND MIXING EXTENSIONS OF TOPOLOGICAL TRANSFORMATION SEMIGROUPS 
    Gerco, Anatolie (Institutul de Matematică şi Informatică al AŞM, 2003)
    We extend the concept of the ergodic set [1] – [2] from topological trans-formation groups to topological transformation semigroups. We investigate, in par-ticular, connections between ergodicity, weak ergodicity, topological ...
  • GLOBAL ATTRACTORS FOR V -MONOTONE NONAUTONOMOUS DYNAMICAL SYSTEMS 
    Cheban, David; Kloeden, Peter-E.; Schmalfuss, Bjorn (Institutul de Matematică şi Informatică al AŞM, 2003)
    This article is devoted to the study of the compact global atrractors of Vmomotone nonautonomous dynamical systems.We give a description of the structure of compact global attractors of this class of systems. Several ...
  • ON STRONG STABILITY OF LINEAR POISSON ACTIONS 
    Glavan, Vasile; Rzeszotko, Z. (Institutul de Matematică şi Informatică al AŞM, 2003)
    Linear Poisson actions of the groupRmare considered. Conditions on thejoint spectrum of the generators and on the centralizers assuring stability and strongstability of the action are given. We give also some examplesof ...
  • THE PACKING KNAPSACK PROBLEM, AND THE K-OPTIMAL TREE IN A WEIGHTED DIGRAPH 
    Lozovanu, Dumitru (2003)
    We consider the packing knapsack problem, which generalizes the classical knapsack problem. A dynamic programming algorithm for solving this problem and its applicationto find the k-optimal tree in a weighted directed graph ...
  • LINEAR SINGULAR PERTURBATIONS OF HYPERBOLIC-PARABOLIC TYPE 
    Perjan, Andrei (Academia de Ştiinţe a Moldovei, 2003)
    We study the behavior of solutions of the problem εu′′(t)+u′(t)+Au(t) =f (t), u(0) = u0, u′(0) = u1 in the Hilbert space H as ε → 0, where A is a linear,symmetric, strong positive operator.
  • ASYMPTOTIC STABILITY OF AUTONOMOUSAND NON-AUTONOMOUS DISCRETE LINEAR INCLUSIONS 
    Cheban, David; Mammana, Cristiana (Institutul de Matematică şi Informatică al AŞM, 2004)
    The article is devoted to the study of absolute asymptotic stability ofdiscrete linear inclusions (both autonomous and non-autonomous) in Banach space.We establish the relation between absolute asymptotic stability, uniform ...
  • THE SCHAUDER BASIS IN SYMMETRICALLY NORMED IDEALSOF OPERATORS 
    Spinu, Efimii (Institutul de Matematică şi Informatică al AŞM, 2004)
    In this paper we build a basis in a separable symmetrically normed ideal.
  • THE OPTIMAL FLOW IN DYNAMIC NETWORKSWITH NONLINEAR COST FUNCTIONS ON EDGES 
    Fonoberova, Maria; Lozovanu, Dmitrii (Institutul de Matematică şi Informatică al AŞM, 2004)
    In this paper we study the dynamic version of the nonlinear minimum- cost flow problem on networks. We consider the problem on dynamic networks with nonlinear cost functions on edges that depend on time and flow. Moreover, ...
  • B-STABLE SUBGRAPHS IN UNDIRECTED GRAPHS 
    Grigoriu, Nicolae (Valines SRL, 2004)
    In this article special structures of stable subgraphs and some of their most important properties that will be necessary for calculation of the number of transitive orientations of an undirected graph are described.
  • INVARIANT MANIFOLDS, GLOBAL ATTRACTORS AND ALMOST PERIODIC SOLUTIONS OF NONAUTONOMOUS DIFFERENCE EQUATIONS 
    Cheban, David; Mammana, Cristiana (Elsevier, 2004)
    The article is devoted to the study of quasi-linear nonautonomous difference equations: invariant manifolds, compact global attractors, almost periodic and recurrent solutions and chaotic sets. First, we prove that such ...
  • ALMOST PERIODIC SOLUTIONS AND GLOBAL ATTRACTORS OF NON-AUTONOMOUS NAVIER–STOKES EQUATIONS 
    Cheban, David; Duan, Jinqiao (Springer, 2004)
    The article is devoted to the study of non-autonomous Navier–Stokes equations. First, the authors have proved that such systems admit compact global attractors. This problem is formulated and solved in the terms of general ...
  • A TEST FOR COMPLETENESS WITH RESPECT TO IMPLICIT REDUCIBILITY IN THE CHAIN SUPER-INTUTIONISTIC LOGICS 
    Cucu, Ion V. (Institutul de Matematică şi Informatică al AŞM, 2006)
    We examine chain logicsC2, C3, . . . ,which are intermediary betweenclassical and intuitionistic logics. They are also the logics of pseudo-Boolean algebrasof type< Em,&,∨,⊃,¬>, whereEmis the chain 0< τ1< τ2<···< τm−2<1 ...
  • THE MULTIDIMENSIONAL DIRECTED EULER TOUROF CUBIC MANIFOLD 
    Bujac, Mariana (Institutul de Matematică şi Informatică al AŞM, 2006)
    n the paper [3] we tried to generalize the problem of existence of a di-rected (n−1)-dimensional Euler tour for the abstract directedn-dimensional manifold,which is acomplex of multi-ary relations[5], namely by means of ...
  • JUNIOR SPATIAL GROUPS OF (221)-SYMMETRY 
    Shenesheutskaia, Alla (Institutul de Matematică şi Informatică al AŞM, 2006)
    The connection between junior groups of three independent kinds ofantisymmetry transformations and junior groups of (221)-symmetry, derived fromspace Fedorov groups was established. This connection allowed us to find all ...
  • COLLOCATION AND QUADRATURE METHODS FOR SOLVING SINGULAR INTEGRAL EQUATIONS WITH PIECEWISE CONTINUOUS COEFFICIENTS 
    Capcelea, Titu (Institutul de Matematică şi Informatică al AŞM, 2006)
    The computation schemes of collocation and mechanical quadraturemethods for approximate solving of the complete singular integral equations withpiecewise continuous coefficients and a regular kernel with weak singularity ...
  • ON THE DIVISION OF ABSTRACT MANIFOLDS IN CUBES 
    Bujac, Mariana; Cataranciuc, Sergiu; Soltan, Petru (Institutul de Matematică şi Informatică al AŞM, 2006)
    We prove that in the class of abstract multidimensional manifolds withoutborders only torusVn1of dimensionn≥1 can be divided in abstract cubes with theproperty: every faceImfromVn1is shared by 2n−mcubes,m= 0,1, . . . , ...
  • NUMERICAL TREATMENT OF THE KENDALL EQUATIONIN THE ANALYSIS OF PRIORITY QUEUEING SYSTEMS 
    Bejan, Andrei (Institutul de Matematică şi Informatică al AŞM, 2006)
    We investigate here how to treat numerically the Kendall functional equa-tion occuring in the theory of branching processes and queueing theory. We discussthis question in the context of priority queueing systems with ...
  • ABSOLUTE ASYMPTOTIC STABILITY OF DISCRETE LINEAR INCLUSIONS 
    Cheban, David; Mammana, Cristiana (Institutul de Matematică şi Informatică al AŞM, 2006)
    The article is devoted to the study of absolute asymptotic stability of discrete linear inclusions in Banach (both finite and infinite dimensional) space. We establish the relation between absolute asymptotic stability, ...
  • LIMITS OF SOLUTIONS TO THE SEMILINEAR WAVE EQUATION WITH SMALL PARAMETER 
    Perjan, Andrei (Academia de Ştiinţe a Moldovei, 2006)
    We study the existence of the limits of solution to singularly perturbed initial boundary value problem of hyperbolic - parabolic type with boundary Dirichlet condition for the semilinear wave equation. We prove the ...

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