The cosine equation method for the eigenproblem of bounded normal operators in Hilbert space
M. Altman (1965)
Annales Polonici Mathematici
Similarity:
M. Altman (1965)
Annales Polonici Mathematici
Similarity:
Margalida Mas Grimalt, Joan Torrens, Tomasa Calvo, Marc Carbonell (1999)
Mathware and Soft Computing
Similarity:
This work is devoted to find and study some possible idempotent operators on a finite chain L. Specially, all idempotent operators on L which are associative, commutative and non-decreasing in each place are characterized. By adding one smoothness condition, all these operators reduce to special combinations of Minimum and Maximum.
Peter Šemrl (2007)
Banach Center Publications
Similarity:
The set of all bounded linear idempotent operators on a Banach space X is a poset with the partial order defined by P ≤ Q if PQ = QP = P. Another natural relation on the set of idempotent operators is the orthogonality relation defined by P ⊥ Q ⇔ PQ = QP = 0. We briefly survey known theorems on maps on idempotents preserving order or orthogonality. We discuss some related results and open problems. The connections with physics, geometry, theory of automorphisms, and linear preserver...
Vladimir Rakočević (2000)
Publications de l'Institut Mathématique
Similarity:
Litvinov, G.L. (2005)
Zapiski Nauchnykh Seminarov POMI
Similarity:
S. Brzychczy (1967)
Colloquium Mathematicae
Similarity:
Messirdi, Bekkai, Mortad, Mohammed Hichem (2008)
Banach Journal of Mathematical Analysis [electronic only]
Similarity:
Sever Silvestru Dragomir (2017)
Concrete Operators
Similarity:
Some trace inequalities of Shisha-Mond type for operators in Hilbert spaces are provided. Applications in connection to Grüss inequality and for convex functions of selfadjoint operators are also given.
B. S. Yadav, P. B. Ramanujan (1969)
Matematički Vesnik
Similarity:
Robert W. Quackenbush (1974)
Colloquium Mathematicae
Similarity:
Saworotnow, P.P. (2003)
International Journal of Mathematics and Mathematical Sciences
Similarity: