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In this paper we show that the Aron-Berner type extension of polynomials preserves the P-continuity property. To this end we introduce a new version of Goldstine's Theorem for locally complemented subspaces., Depto. de Análisis Matemático y Matemática Aplicada, Fac. de Ciencias Matemáticas, TRUE, pub

A bounded linear operator T on a Banach space X is called hypercyclic if there exists a vector x is an element of X such that its orbit, {T(n)x}, is dense in X. In this paper we show hypercyclic properties of the orbits of the Cesaro operator defined on different spaces. For instance, we show that the Cesaro operator defined on L(p)[0, 1] (1 < p < infinity) is hypercyclic. Moreover, it is chaotic and it has supercyclic subspaces. On the other hand, the Cesaro operator defined on other spaces of functions behave differently. Motivated by this, we study weighted Cesaro operators and different degrees of hypercyclicity are obtained. The proofs are based on the classical Muntz-Szasz theorem. We also propose problems and give new directions., Junta de Andalucia, UCA, Junta de Andalucıa, Depto. de Análisis Matemático y Matemática Aplicada, Fac. de Ciencias Matemáticas, Instituto de Matemática Interdisciplinar (IMI), TRUE, pub

The aim of this paper is to show that there exist infinite dimensional Banach spaces of functions that, except for 0, satisfy properties that apparently should be destroyed by the linear combination of two of them. Three of these spaces are: a Banach space of differentiable functions on R(n) failing the Denjoy-Clarkson property; a Banach space of non Riemann integrable bounded functions, but with antiderivative at each point of an interval; a Banach space of infinitely differentiable functions that vanish at infinity and are not the Fourier transform of any Lebesgue integrable function., MEC and FEDER, Marie Curie Intra European Fellowship, MEC and FEDER, Depto. de Análisis Matemático y Matemática Aplicada, Fac. de Ciencias Matemáticas, Instituto de Matemática Interdisciplinar (IMI), TRUE, pub