Lucas Jódar (1984)
Stochastica
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We study the relation between the sets of cyclic vectors of an unilateral bounded below weighted shift operator T and T where S is an invariant subspace of T. It is proved that T can not be unicellular and known results are generalized.
Lucas Jódar (1983)
Stochastica
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In this paper a class of injective unilateral weighted shift operators is introduced which contains strictly the class of the strictly cyclic operators and which can only be unicellular if they are quasinilpotent.
Lucas Jódar (1985)
Stochastica
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In the present paper we prove that a strictly cyclic, not invertible unicellular operator is quasinilpotent.
Lucas Jódar (1985)
Stochastica
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Estudiamos la existencia de subespacios hiperinvariantes de operadores desplazamiento bilateral ponderados e invertibles definidos sobre un espacio de Hilbert con base ortogonal {e}, n perteneciendo a Z, por la expresión T e = w e, donde las sucesiones {w} y {w}, con n = 1, ..., ∞, son convergentes.
Vicente Hernández, Lucas Jódar (1983)
Stochastica
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By means of the application of annihilating entire functions of an operator, the bilateral quadratic equation in operators A + BT +TC + TDT = 0, is changed into an unilateral linear equation, obtaining conditions under which the solutions of such linear equation satisfy the quadratic equation.
Alberto Falqués Serra (1982)
Stochastica
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In this paper it is first shown that the linear evolution equations for a generalized thermoelastic solid generate a C semigroup. Next an analysis of the long time evolution behaviour yields the some results known for classical thermoelasticity: generically, the natural state is asymptotically stable.
A. Bahamonde Rionda, J. S. López García (1985)
Stochastica
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Partially-additive monoids (pams) were introduced by Arbib and Manes ([1]) in order to provide an algebraic approach to the semantic of recursion in theoretical computer science. Here we extend the range of application of pams for capturing information theory concepts as componibility and sequential continuity, which arise naturally in this framework.
Lucas Jodar (1983)
Collectanea Mathematica
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Josep M.ª Fortuny (1984)
Stochastica
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Probabilistic inner product spaces are studied with detail.