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ORBi Open Repository and Bibliography (301.662 recursos)

In may 2007, the ULg's Administrative Board (joined in June 2007 by the FUSAGx) decided to create an institutional repository and defined a strong institutional self-archiving policy to increase the visibility, accessibility and impact of the University's publications (Board's decision). This decision led to the official launch, in November 2008, of the ORBi platform including both the Academic Bibliography and the Institutional Repository of the Wallonia-Europe University Academy.

Physical, chemical, mathematical & earth Sciences => Mathematics

Mostrando recursos 1 - 20 de 85

  1. Special issue: Twelfth Workshop on Models and Algorithms for Planning and Scheduling Problems (MAPSP 2015)


    Peer reviewed

  2. Special issue: Twelfth Workshop on Models and Algorithms for Planning and Scheduling Problems (MAPSP 2015)


    Peer reviewed

  3. Permutation groups and the Morse-Hedlund Theorem

    Charlier, Emilie
    In this talk I presented the results of the paper "On a group theoretic generalization of the Morse-Hedlund theorem", which is a joint work with Svetlana Puzynina and Luca Zamboni. In this paper, we give a broad unified framework via group actions for constructing complexity functions of infinite words. Factor complexity, Abelian complexity and cyclic complexity are all particular cases of this general construction.

  4. An open question about diametral dimensions

    Demeulenaere, Loïc
    The diametral dimension is a topological invariant which characterizes Schwartz and nuclear spaces. However, there exists another diametral dimension which was conjectured by Bessaga, Mityagin, Pełczynski, and Rolewicz to be equal to the first one in Fréchet spaces. In this talk, we describe some conditions which assure the equality of the two diametral dimensions in metrizable locally convex spaces. Besides, we explain why such an equality is generally impossible in non-metrizable spaces.

  5. Théorèmes et problèmes de géométrie élémentaire

    Catalan, Eugène
    Cinquième édition, revue

  6. Traité élémentaire de géométrie descriptive : atlas

    Catalan, Eugène
    Quatrième édition, revue et augmentée

  7. Ecologie du formalisme "bipoint" dans l'enseignement de la géométrie au niveau secondaire

    Nguyen, Ngan Giang

  8. An algorithm for computing non-concave multifractal spectra using the Sν spaces

    Kleyntssens, Thomas; Esser, Céline; Nicolay, Samuel
    Peer reviewed

  9. Une approche heuristique d'une géométrie calculatoire

    Nguyen, Ngan Giang; Gilot, Marguerite

  10. Une approche heuristique d'une géométrie calculatoire

    Nguyen, Ngan Giang; Schneider-Gilot, Marguerite

  11. Some notions of compactness in Functional Analysis and one related question about diametral dimensions

    Demeulenaere, Loïc
    The diametral dimension is a topological invariant on the class of topological vector spaces. Besides, there exists another diametral dimension which was claimed to be equal to the first one in Fréchet(-Schwartz) spaces. However, this equality has never been proved. In this talk, we make some reminders about Functional Analysis and some related concepts (seminorms, locally convex spaces, etc.) and we insist on some notions linked to compactness. We also introduce the associated notions of Montel spaces and Schwartz spaces. Then, we introduce the question about the equality of the two diametral dimensions and we explain why this is directly solved...

  12. Stein's method, many interacting worlds and quantum mechanics

    McKeague, Ian; Peköz, Erol; Swan, Yvik
    Peer reviewed

  13. Fully leafed induced subtrees

    Blondin Massé, Alexandre; de Carufel, Julien; Goupil, Alain; Lapointe, Mélodie; Nadeau, Emile; Vandomme, Elise
    Let G be a simple graph of n vertices. We consider the problem ISil of deciding whether there exists an induced subtree with exactly i ≤ n vertices and l leaves in G. We also study the associated optimization problem, that consists in computing the maximal number of leaves, denoted by L_G(i), realized by an induced subtree with i vertices, for 2 ≤ i ≤ n. We compute the values of the map L_G for some classical families of graphs and in particular for the d-dimensional hypercubic graphs Q_d , d ≤ 6. Then we prove that the ISil problem...

  14. Statistiques et méthodes de recherche (Biostatistiques)

    Vander Haegen, Marie

  15. Les théorèmes d'incomplétude

    Hoyoux, Renaud
    Mémoire défendu en vue de l'obtention du titre de Master en sciences mathématiques portant sur les théorèmes d'incomplétude et constitué de quatre chapitres : le premier est un rappel des bases en logique formelle et en théorie des fonctions récursives; le second est consacré aux théorèmes d'incomplétude de Gödel; le troisième présente un exemple détaillé d'un énoncé aisé à comprendre mais néanmoins indémontrable dans l'arithmétique de Peano; le dernier explorant les possibilités de "mesure" des théorèmes indémontrables.

  16. Regularized Discriminant Analysis in Presence of Cellwise Contamination

    Aerts, Stéphanie; Wilms, Ines
    Quadratic and Linear Discriminant Analysis (QDA/LDA) are the most often applied classification rules under normality. In QDA, a separate covariance matrix is estimated for each group. If there are more variables than observations in the groups, the usual estimates are singular and cannot be used anymore. Assuming homoscedasticity, as in LDA, reduces the number of parameters to estimate. This rather strong assumption is however rarely verified in practice. Regularized discriminant techniques that are computable in high-dimension and cover the path between the two extremes QDA and LDA have been proposed in the literature. However, these procedures rely on sample covariance...

  17. Diametral dimension and property Omega Bar for spaces Snu

    Demeulenaere, Loïc
    Spaces Snu are metrizable sequence spaces defined by Jaffard in the context of multifractal analysis and signal treatment. From a functional analysis point of view, the study of these spaces points out some topological properties, such as the facts they are locally pseudoconvex in general and locally p-convex in certain cases, Schwartz, and non-nuclear. In this talk, we focus on two topological invariants, namely the diametral dimension (Bessaga, Mityagin, Pelczynski, Rolewicz) and the property "Omega Bar" (Vogt, Wagner). Firstly, we revisit a result of Aubry and Bastin giving the diametral dimension of locally p-convex spaces Snu and extend it to some...

  18. Constant 2-labellings and an application to (r,a,b)-covering codes

    Vandomme, Elise; Gravier, Sylvain
    Peer reviewed

  19. Logic, Decidability and Numeration Systems

    Charlier, Emilie
    The theorem of Büchi-Bruyère states that a subset of N^d is b-recognizable if and only if it is b-definable. As a corollary, the first-order theory of (N,+,V_b) is decidable (where V_b(n) is the largest power of the base b dividing n). This classical result is a powerful tool in order to show that many properties of b-automatic sequences are decidable. The first part of my lecture will be devoted to presenting this result and its applications to b-automatic sequences. Then I will move to b-regular sequences, which can be viewed as a generalization of b-automatic sequences to integer-valued sequences. I...

  20. Developments in Language Theory


    The series of international conferences on Developments in Language Theory provides a forum for presenting current developments in formal languages and automata. Its scope is very general and includes, among others, the following topics and areas: combinatorial and algebraic properties of words and languages; grammars, acceptors and transducers for strings, trees, graphs, arrays; algebraic theories for automata and languages; codes; efficient text algorithms; symbolic dynamics; decision problems; relationships to complexity theory and logic; picture description and analysis; polyominoes and bidimensional patterns; cryptography; concurrency; cellular automata; bio-inspired computing; quantum computing. The papers submitted to DLT 2017 were from 19 countries including...

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