Browsing 2008 by MFO Scientific Program "Research in Pairs 2008"

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    • Epsilon-hypercyclic operators 

      [OWP-2008-19] Badea, Catalin; Grivaux, Sophie; Müller, Valdimir (Mathematisches Forschungsinstitut Oberwolfach, 2008-03-19)
      For each fixed number $\varepsilon$ in $(0, 1)$ we construct a bounded linear operator on the Banach space $\ell_1$ having a certain orbit which intersects every cone of aperture $\varepsilon$, but with every orbit avoiding ...

    • Noncommutative topological entropy of endomorphismus of Cuntz Algebras 

      [OWP-2008-12] Skalski, Adam; Zacharias, Joachim (Mathematisches Forschungsinstitut Oberwolfach, 2008-03-16)
      Noncommutative topological entropy estimates are obtained for ‘finite range’ endomorphisms of Cuntz algebras,generalising known results for the canonical shift endomorphisms. Exact values are computed for a class of ...

    • Preconditioning of Block Tridiagonal Matrices 

      [OWP-2008-05] Axelsson, Owe; Karatson, Janos (Mathematisches Forschungsinstitut Oberwolfach, 2008-03-09)
      Preconditioning methods via approximate block factorization for block tridiagonal matrices are studied. Bounds for the resulting condition numbers are given, and two methods for the recursive construction of the approximate ...

    • Quantities that frequency-dependent selection maximizes 

      [OWP-2008-18] Matessi, Carlo; Schneider, Kristian (Mathematisches Forschungsinstitut Oberwolfach, 2008-03-18)
      We consider a model of frequency-dependent selection, to which we refer as the Wildcard Model, that accommodates as particular cases a number of diverse models of biologically specific situations. Two very different ...

    • Stratifying modular representations of finite groups 

      [OWP-2008-20] Benson, David J.; Iyengar, Srikanth B.; Krause, Henning (Mathematisches Forschungsinstitut Oberwolfach, 2008-03-20)
      We classify localising subcategories of the stable module category of a finite group that are closed under tensor product with simple (or, equivalently all) modules. One application is a proof of the telescope conjecture ...