Hyperinvariant subspaces of operators on Hilbert spaces
Štefan Drahovský, Michal Zajac (1994)
Banach Center Publications
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Displaying similar documents to “Unitary asymptotes of Hilbert space operators”
Hyperinvariant subspaces of operators on Hilbert spaces
On a general bidimensional extrapolation problem
Rodrigo Arocena, Fernando Montana (1993)
Colloquium Mathematicae
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Several generalized moment problems in two dimensions are particular cases of the general problem of giving conditions that ensure that two isometries, with domains and ranges contained in the same Hilbert space, have commutative unitary extensions to a space that contains the given one. Some results concerning this problem are presented and applied to the extension of functions of positive type.
Unitary extensions of isometries, generalized interpolation and band extensions
Rodrigo Arocena (1997)
Banach Center Publications
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The aim of this paper is to give a very brief account of some applications of the method of unitary extensions of isometries to interpolation and extension problems.
Some invariant subspaces for A-contractions and applications
Laurian Suciu (2006)
Extracta Mathematicae
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Some invariant subspaces for the operators A and T acting on a Hilbert space H and satisfying T*AT ≤ A and A ≥ 0, are presented. Especially, the largest invariant subspace for A and T on which the equality T* AT = A occurs, is studied in connections to others invariant or reducing subspaces for A, or T. Such subspaces are related to the asymptotic form of the subspace quoted above, this form being obtained using the operator limit of the sequence {TAT; n ≥ 1}. More complete results are...
On subnormal operators whose spectrum are multiply connected domains.
Carlsson, M. (2011)
The New York Journal of Mathematics [electronic only]
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Orthogonal random vectors and the Hurwitz-Radon-Eckmann theorem.
Vakhania, N. (1994)
Georgian Mathematical Journal
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The range of a contractive projection in L(H).
Yves Raynaud (2004)
Revista Matemática Complutense
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We show that the range of a contractive projection on a Lebesgue-Bochner space of Hilbert valued functions L(H) is isometric to a l-direct sum of Hilbert-valued L-spaces. We explicit the structure of contractive projections. As a consequence for every 1 < p < ∞ the class C of l-direct sums of Hilbert-valued L-spaces is axiomatizable (in the class of all Banach spaces).
On the spectra of some non-normal operators.
Rashid, M.H.M., Noorani, M.S.M., Saari, A.S. (2008)
Bulletin of the Malaysian Mathematical Sciences Society. Second Series
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On a -polar decomposition of a bounded operator and matrices of -symmetric and -skew-symmetric operators.
Zagorodnyuk, Sergey M. (2010)
Banach Journal of Mathematical Analysis [electronic only]
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Additive combinations of special operators
Pei Wu (1994)
Banach Center Publications
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This is a survey paper on additive combinations of certain special-type operators on a Hilbert space. We consider (finite) linear combinations, sums, convex combinations and/or averages of operators from the classes of diagonal operators, unitary operators, isometries, projections, symmetries, idempotents, square-zero operators, nilpotent operators, quasinilpotent operators, involutions, commutators, self-commutators, norm-attaining operators, numerical-radius-attaining operators, irreducible...
Nonautonomous Livšic colligations and hyponormal operators.
Vorobyov, I.V. (2009)
Acta Mathematica Universitatis Comenianae. New Series
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On the class operators.
Bachir, A., Segres, A. (2009)
International Journal of Open Problems in Computer Science and Mathematics. IJOPCM
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