7,732 research outputs found

    Open problems in Banach spaces and measure theory

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    We collect several open questions in Banach spaces, mostly related to measure theoretic aspects of the theory. The problems are divided into five categories: miscellaneous problems in Banach spaces (non-separable LpL^p spaces, compactness in Banach spaces, w∗w^*-null sequences in dual spaces), measurability in Banach spaces (Baire and Borel σ\sigma-algebras, measurable selectors), vector integration (Riemann, Pettis and McShane integrals), vector measures (range and associated L1L^1 spaces) and Lebesgue-Bochner spaces (topological and structural properties, scalar convergence)

    Simultaneous universality

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    In this paper, the notion of simultaneous universality is introduced, concerning operators having orbits that simultaneously approximate any given vector. This notion is related to the well known concepts of universality and disjoint universality. Several criteria are provided, and several applications to specific operators or sequences of operators are performed, mainly in the setting of sequence spaces or spaces of holomorphic functions.Plan Andaluz de Investigación (Junta de Andalucía)Ministerio de Economía y CompetitividadDeutsche Forschungsgemeinschaf
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