The unitary amicable pairs to .
Najar, Rudolph M. (1995)
International Journal of Mathematics and Mathematical Sciences
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Najar, Rudolph M. (1995)
International Journal of Mathematics and Mathematical Sciences
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Paul Muhly (1974)
Studia Mathematica
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Chafiq Benhida (2004)
Studia Mathematica
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Given two contractions T and T' such that T'-T is an operator of finite rank, we prove, under some conditions, the unitary equivalence of the unitary parts of the minimal isometric dilations (respectively minimal co-isometric extensions) of T and T'.
Julio Becerra Guerrero, Simon Cowell, Ángel Rodríguez Palacios, Geoffrey V. Wood (2004)
Studia Mathematica
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In a Banach algebra an invertible element which has norm one and whose inverse has norm one is called unitary. The algebra is unitary if the closed convex hull of the unitary elements is the closed unit ball. The main examples are the C*-algebras and the ℓ₁ group algebra of a group. In this paper, different characterizations of unitary algebras are obtained in terms of numerical ranges, dentability and holomorphy. In the process some new characterizations of C*-algebras are given. ...
T. Ando, K. Takahashi (1997)
Annales Polonici Mathematici
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We show a polynomially boundend operator T is similar to a unitary operator if there is a singular unitary operator W and an injection X such that XT = WX. If, in addition, T is of class , then T itself is unitary.
Birgit Speh (1981)
Mathematische Annalen
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I. Halperin (1963)
Studia Mathematica
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A. R. Amir-Moéz, W. A. Donnell, C. R. Perry (1972)
Matematički Vesnik
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Dragomir Z. Dokovic (1991)
Aequationes mathematicae
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Marek Ptak (1985)
Annales Polonici Mathematici
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W.B. Gragg, L. Reichel (1990)
Numerische Mathematik
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Oliver H. King (1983)
Mathematische Zeitschrift
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Tóth, László (2009)
Journal of Integer Sequences [electronic only]
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László Tóth (1989)
Collectanea Mathematica
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Putnam, C.R. (1981)
International Journal of Mathematics and Mathematical Sciences
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