Hardtke, Jan-David(Universitat Politècnica de València, 2011-04-01)
[EN] Let X be a real Banach space. A subset B of the dual unit sphere of X is said to be a boundary for X, if every element of X attains its norm on some functional in B. The well-known Boundary Problem originally posed ...
Zvina, Irina(Universitat Politècnica de València, 2011-04-01)
[EN] We introduce the notion of generalized topological space (gt-space). Generalized topology of gt-space has the structure of frame and is closed under arbitrary unions and finite intersections modulo small subsets. The ...
Ayadi, Adlene(Universitat Politècnica de València, 2011-04-01)
[EN] We prove that the minimal number of matrices on Cn required to forma hypercyclic abelian semigroup on Cn is n+1. We also prove that theaction of any abelian semigroup finitely generated by matrices on Cnor Rn is never ...
Banak, Taras; Guran, Igor; Ravsky, Alex(Universitat Politècnica de València, 2011-04-01)
[EN] We prove that a Hausdorff paratopological group G is meager if andonly if there are a nowhere dense subset A G and a countable setC G such that CA = G = AC.