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# Documents  Gallardo-Gutiérrez, Eva A. | enregistrements trouvés : 3

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## Spectral decompositions and an extension of a theorem of Atzmon: a couple leading to spectral subspaces for Bishop operators Gallardo-Gutiérrez, Eva A. | CIRM H

Post-edited

Research talks

Bishop’s operator arose in the fifties as possible candidates for being counterexamples to the Invariant Subspace Problem. Several authors addressed the problem of finding invariant subspaces for some of these operators; but still the general problem is open. In this talk, we shall discuss about recent results on the existence of invariant subspaces which are indeed spectral subspaces for Bishop operators, by providing an extension of a Theorem of Atzmon (Joint work with M. Monsalve-Lopez). Bishop’s operator arose in the fifties as possible candidates for being counterexamples to the Invariant Subspace Problem. Several authors addressed the problem of finding invariant subspaces for some of these operators; but still the general problem is open. In this talk, we shall discuss about recent results on the existence of invariant subspaces which are indeed spectral subspaces for Bishop operators, by providing an extension of a Theorem ...

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## The invariant subspace problem: a concrete operator theory approach Gallardo-Gutiérrez, Eva A. | CIRM H

Multi angle

Research talks;Analysis and its Applications;Mathematical Physics

The Invariant Subspace Problem for (separable) Hilbert spaces is a long-standing open question that traces back to Jonhn Von Neumann's works in the fifties asking, in particular, if every bounded linear operator acting on an infinite dimensional separable Hilbert space has a non-trivial closed invariant subspace. Whereas there are well-known classes of bounded linear operators on Hilbert spaces that are known to have non-trivial, closed invariant subspaces (normal operators, compact operators, polynomially compact operators,...), the question of characterizing the lattice of the invariant subspaces of just a particular bounded linear operator is known to be extremely difficult and indeed, it may solve the Invariant Subspace Problem.

In this talk, we will focus on those concrete operators that may solve the Invariant Subspace Problem, presenting some of their main properties, exhibiting old and new examples and recent results about them obtained in collaboration with Prof. Carl Cowen (Indiana University-Purdue University).
The Invariant Subspace Problem for (separable) Hilbert spaces is a long-standing open question that traces back to Jonhn Von Neumann's works in the fifties asking, in particular, if every bounded linear operator acting on an infinite dimensional separable Hilbert space has a non-trivial closed invariant subspace. Whereas there are well-known classes of bounded linear operators on Hilbert spaces that are known to have non-trivial, closed ...

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## The role of the spectrum in the cyclic behavior of composition operators Gallardo-Gutiérrez, Eva A. ; Montes-Rodriguez, Alfonso | American Mathematical Society 2004

Ouvrage

- 81 p.
ISBN 978-0-8218-3432-9

Memoirs of the american mathematical society , 0791

Localisation : Collection 1er étage

espace de fonction # opérateur linéaire # fonction de variable complexe # fonction hypergéométrique # opérateur de composistion # opérateur cyclique # opérateur supercyclique # opérateur hypercyclique # spectre # transformation de Fourier # mesure de Haar # zéro de fonction holomorphe # polynôme de Laguerre

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