Uniqueness of invariant Hahn-Banach extensions.
P. Bandyopadhyay, A. K. Roy (2007)
Extracta Mathematicae
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P. Bandyopadhyay, A. K. Roy (2007)
Extracta Mathematicae
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Chipalkatti, Jaydeep V. (2006)
Beiträge zur Algebra und Geometrie
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Bistroń, Anna (2005)
Zeszyty Naukowe Uniwersytetu Jagiellońskiego. Universitatis Iagellonicae Acta Mathematica
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Salvai, Marcos (2003)
Journal of Lie Theory
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Siriwat, Piyanuch, Meleshko, Sergey V. (2008)
SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]
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García, Alicia N., Sánchez, Cristián U. (2004)
Beiträge zur Algebra und Geometrie
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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...
Janusz Mierczyński (1998)
Colloquium Mathematicae
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Matsuki, Toshihiko (2003)
Journal of Lie Theory
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Roman Badora (1993)
Annales Polonici Mathematici
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We present some extension of the concept of an invariant mean to a space of vector-valued mappings defined on a semigroup. Next, we apply it to the study of the stability of some functional equation.
Lomadze, N. (1997)
Georgian Mathematical Journal
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Tabor, Jacek (2005)
Zeszyty Naukowe Uniwersytetu Jagiellońskiego. Universitatis Iagellonicae Acta Mathematica
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