Nonselfadjoint boundary value problems at resonance. Nonlinearities which may grow linearly.
Asymmetric elliptic problems with indefinite weights
An asymmetric Neumann problem with weights
On partial isometries in C*-algebras
We study similarity to partial isometries in C*-algebras as well as their relationship with generalized inverses. Most of the results extend some recent results regarding partial isometries on Hilbert spaces. Moreover, we describe partial isometries by means of interpolation polynomials.
Characterization of Bessel sequences.
Let H be a separable Hilbert space, L(H) be the algebra of all bounded linear operators of H and (H) be the set of all Bessel sequences of H. Fixed an orthonormal basis E = {e} of H, a bijection α: (H) → L(H) can be defined. The aim of this paper is to characterize α (A) for different classes of operators A ⊆ L(H). In particular, we characterize the Bessel sequences associated to injective operators, compact operators and Schatten p-classes.
Tratamiento estadístico de la mortalidad fetal en España.
Partiendo de datos recogidos en distintas publicaciones del INE se estudia la mortalidad fetal en diversas provincias españolas, así como la incidencia de las características sanitarias y socio-económicas en dicha mortalidad. Se aplican para ello diversos modelos con el fin de obtener una descripción lo más completa y polifacética posible del problema en estudio. Se obtienen varias clasificaciones e histogramas de interés y se concluye que, en efecto, los índices de mortalidad fetal...
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