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Listar por palabra clave "Ballean"

RiuNet: Repositorio Institucional de la Universidad Politécnica de Valencia

Listar por palabra clave "Ballean"

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    Asymptotic proximities 
    Protasov, Igor V. (Universitat Politècnica de València, 2008-10-01)
    [EN] A ballean is a set endowed with some family of subsets which are called the balls. The properties of the family of balls are postulated in such a way that the balleans can be considered as a natural asymptotic ...
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    Cellularity and density of balleans 
    Protasov, Igor V. (Universitat Politècnica de València, 2007-10-01)
    [EN] A ballean is a set X endowed with some family F of balls in such a way that a ballean can be considered as an asymptotic counterpart of a uniform topological space. Then we define the asymptotic counterparts for dense ...
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    Counting coarse subsets of a countable group 
    Protasov, Igor; Protasova, Ksenia (Universitat Politècnica de València, 2018-04-02)
    [EN] For every countable group G, there are 2ω distinct classes of coarselyequivalent subsets of G.
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    Extremal balleans 
    Protasov, Igor (Universitat Politècnica de València, 2019-04-01)
    [EN] A ballean (or coarse space) is a set endowed with a coarse structure. A ballean X is called normal if any two asymptotically disjoint subsets of X are asymptotically separated. We say that a ballean X is ultra-normal ...
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    Maximal balleans 
    Protasova, Olga I. (Universitat Politècnica de València, 2006-10-01)
    [EN] A ballean is a set X endowed with some family of subsets of X which are called the balls. We postulate the properties of the family of balls in such a way that the balleans with the appropriate morphisms can be ...
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    Spread of balleans 
    Filali, Mahmoud; Protasov, Igor V. (Universitat Politècnica de València, 2008-10-01)
    [EN] A ballean is a set endowed with some family of balls in such a way that a ballean can be considered as an asymptotic counterpart of a uniform topological space. We introduce and study a new cardinal invariant called ...
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    Thin subsets of balleans 
    Lutsenko, Ievgen; Protasov, Igor V. (Universitat Politècnica de València, 2010-10-01)
    [EN] A ballean is a set endowed with some family of balls in such a way that a ballean can be considered as an asymptotic counterpar tof a uniform topological space. We characterize the ideal generated by the family of all ...