On a completion of prehilbertian spaces.
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Displaying 1 – 20 of 42
On a question of Mbekhta.
Christoph Schmoeger (2005)
Extracta Mathematicae
The present paper deals with a question of M. Mbekhta concerning partial isometries on Banach spaces.
On adjoint of an operator on reflexive Banach spaces
D. K. Sen (1980)
Matematički Vesnik
On algebraic generation of B(X) by two subalgebras with square zero
Peter Šemrl (1990)
Studia Mathematica
On Davis-Kahan-weinberger Extension Theorem
Dragan S. Đorđević (2002)
Matematički Vesnik
On different products of closed operators.
Messirdi, Bekkai, Mortad, Mohammed Hichem (2008)
Banach Journal of Mathematical Analysis [electronic only]
On Dominating Sequences in the Unit Disc.
Hari Bercovici (1984/1985)
Mathematische Zeitschrift
On E. Borel's Theorem.
Hans-Joachim Petzsche (1988)
Mathematische Annalen
On Farkas-type theorems
Winfried Schirotzek (1981)
Commentationes Mathematicae Universitatis Carolinae
On generalized inverses in C*-algebras
Robin Harte, Mostafa Mbekhta (1992)
Studia Mathematica
We investigate when a C*-algebra element generates a closed ideal, and discuss Moore-Penrose and commuting generalized inverses.
On homomorphisms, open operators and their adjoints.
Zarnadze, D. (2001)
Georgian Mathematical Journal
On Neumann operators.
Teresa Bermúdez, Antonio Martinón (1992)
Extracta Mathematicae
On nilpotent operators
Laura Burlando (2005)
Studia Mathematica
We give several necessary and sufficient conditions in order that a bounded linear operator on a Banach space be nilpotent. We also discuss three necessary conditions for nilpotency. Furthermore, we construct an infinite family (in one-to-one correspondence with the square-summable sequences of strictly positive real numbers) of nonnilpotent quasinilpotent operators on an infinite-dimensional Hilbert space, all the iterates of each of which have closed range. Each of these operators (as well as...
On operators of Saphar type.
Schmoeger, Christoph (1994)
Portugaliae Mathematica
On product of projections
Mohammad Sal Moslehian (2004)
Archivum Mathematicum
An operator with infinite dimensional kernel is positive iff it is a positive scalar times a certain product of three projections.
On quasi-analytic vectors for some classes of operators
Istratescu, Vasile I., Constantin, Gheorghe (1983/1984)
Portugaliae mathematica
On real and complex spectra in some real -algebras and applications.
Didenko, V., Silbermann, B. (1999)
Zeitschrift für Analysis und ihre Anwendungen
On representation of linear operators on
Ivan Dobrakov (1971)
Czechoslovak Mathematical Journal
On Some Classes of Operators II.
Vasile ISTRATESCU, Ioana ISTRATESCU (1971)
Mathematische Annalen
On the axiomatic theory of spectrum II
M. Mbekhta, V. Müller (1996)
Studia Mathematica
We give a survey of results concerning various classes of bounded linear operators in a Banach space defined by means of kernels and ranges. We show that many of these classes define a spectrum that satisfies the spectral mapping property.
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