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 (1985)
Stochastica
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In the present paper we prove that a strictly cyclic, not invertible unicellular operator is quasinilpotent.
Lucas Jódar (1983)
Stochastica
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In this paper the analytic-spectral structure of the commutant of an invertible bilateral weighted shift operator is studied, extending known results. A class of operators is introduced, more general than the class of the rationally strictly cyclic bilateral shift [operators] which are not unicellular.
Lucas Jodar (1983)
Collectanea Mathematica
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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.
Lucas Jodar (1986)
Revista de la Real Academia de Ciencias Exactas Físicas y Naturales
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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.
Carme Burgués (1981)
Stochastica
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We prove that two archimedean t-norms with equal diagonal sections and zero-sets must be identical.
Lucas Jódar (1986)
Revista de la Real Academia de Ciencias Exactas Físicas y Naturales
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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.