Commuting normal operators in partial -algebras
J.-P. Antoine, W. Karwowski (1989)
Annales de l'I.H.P. Physique théorique
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J.-P. Antoine, W. Karwowski (1989)
Annales de l'I.H.P. Physique théorique
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Teresa Bermúdez, Manuel González (1999)
Extracta Mathematicae
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Ibrahim, Sobhy El-Sayed (2003)
International Journal of Mathematics and Mathematical Sciences
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Spiros A. Argyros, Alexander D. Arvanitakis (2002)
Studia Mathematica
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We present a characterization of continuous surjections, between compact metric spaces, admitting a regular averaging operator. Among its consequences, concrete continuous surjections from the Cantor set 𝓒 to [0,1] admitting regular averaging operators are exhibited. Moreover we show that the set of this type of continuous surjections from 𝓒 to [0,1] is dense in the supremum norm in the set of all continuous surjections. The non-metrizable case is also investigated. As a consequence,...
Kirchev, K., Borisova, G. (1997)
Serdica Mathematical Journal
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* Partially supported by Grant MM-428/94 of MESC. In this paper we present some generalizations of results of M. S. Livšic [4,6], concerning regular colligations (A1, A2, H, Φ, E, σ1, σ2, γ, ˜γ) (σ1 > 0) of a pair of commuting nonselfadjoint operators A1, A2 with finite dimensional imaginary parts, their complete characteristic functions and a class Ω(σ1, σ2) of operator-functions W(x1, x2, z): E → E in the case of an inner function W(1, 0, z) of the class Ω(σ1). ... ...
Mohammed Hichem Mortad (2011)
Colloquium Mathematicae
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We present a new approach to the question of when the commutativity of operator exponentials implies that of the operators. This is proved in the setting of bounded normal operators on a complex Hilbert space. The proofs are based on some results on similarities by Berberian and Embry as well as the celebrated Fuglede theorem.
Andrzej Krupa, Bogdan Zawisza (1987)
Studia Mathematica
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J.-P. Antoine, H. Ogi, A. Inoue, C. Trapani (1995)
Annales de l'I.H.P. Physique théorique
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J. van Casteren, Seymour Goldberg (1970)
Studia Mathematica
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