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Displaying 101 – 120 of 134

On the problem of invariance under holomorphic functions for a set of continuity points of the spectrum function

Laura Burlando (1989)

Czechoslovak Mathematical Journal

On the semi-Browder spectrum

Vladimír Kordula, Vladimír Müller, Vladimir Rakočević (1997)

Studia Mathematica

An operator in a Banach space is called upper (lower) semi-Browder if it is upper (lower) semi-Fredholm and has a finite ascent (descent). We extend this notion to n-tuples of commuting operators and show that this notion defines a joint spectrum. Further we study relations between semi-Browder and (essentially) semiregular operators.

On The Set Of Operators Having A Given Simply Connected Spectral Set.

Mahmoud Kutkut (1981)

Revista colombiana de matematicas

On the spectcral theory of elliptic differential operators. I.

F.E. BROWDER (1961)

Mathematische Annalen

On the Spectra of Certain Semi-Groups.

B. Scarpellini (1974)

Mathematische Annalen

On the spectra of elements in certain algebras of vector valued functions and sequences.

Susanne Dierolf, Khin Aye Aye (1998)

Extracta Mathematicae

On the spectra of some non-normal operators.

Rashid, M.H.M., Noorani, M.S.M., Saari, A.S. (2008)

Bulletin of the Malaysian Mathematical Sciences Society. Second Series

On the Spectral Kernel of Symmetric Extensions.

Winfried Kaballo, Albert Schneider (1979)

Manuscripta mathematica

On the spectral multiplicity of a direct sum of operators

M. T. Karaev (2006)

Colloquium Mathematicae

We calculate the spectral multiplicity of the direct sum T⊕ A of a weighted shift operator T on a Banach space Y which is continuously embedded in $l^{p}$ and a suitable bounded linear operator A on a Banach space X.

On the spectral properties of tensor products of linear operators in Banach spaces

Takashi Ichinose (1982)

Banach Center Publications

On the spectral properties of translation operators in one-dimensional tubes

Wojciech Hyb (1991)

Annales Polonici Mathematici

We study the spectral properties of some group of unitary operators in the Hilbert space of square Lebesgue integrable holomorphic functions on a one-dimensional tube (see formula (1)). Applying the Genchev transform ([2], [5]) we prove that this group has continuous simple spectrum (Theorem 4) and that the projection-valued measure for this group has a very explicit form (Theorem 5).

On the spectral radius of positive operators.

C.D. Aliprantis, Y.A. Abramovich (1992)

Mathematische Zeitschrift

On the spectral radius of positive operators (Corrigendum).

C.D. Aliprantis, Y.A. Abramovich (1994)

Mathematische Zeitschrift

On the spectrum and eigenfunctions of the operator $(V f) (x) = \int_{0}^{x^{α}} f (t) d t$

I. Yu. Domanov (2007)

Banach Center Publications

On the spectrum of a morphism of quotient Hilbert spaces.

Nădăban, Sorin (2006)

Surveys in Mathematics and its Applications

On the spectrum of a one-parameter strongly continous representation.

David E. Evans (1976)

Mathematica Scandinavica

On the spectrum of multipliers in Bessel potential spaces

Tatjana Olegovna Shaposhnikova (1985)

Časopis pro pěstování matematiky

On the spectrum of singularly perturbed operators

O. A. Olejnik (1989)

Journées équations aux dérivées partielles

On the spectrum of stochastic perturbations of the shift and Julia sets

el Houcein el Abdalaoui, Ali Messaoudi (2012)

Fundamenta Mathematicae

We extend the Killeen-Taylor study [Nonlinearity 13 (2000)] by investigating in different Banach spaces ( $ℓ^{α} (ℕ)$ ,c₀(ℕ),c(ℕ)) the point, continuous and residual spectra of stochastic perturbations of the shift operator associated to the stochastic adding machine in base 2 and in the Fibonacci base. For the base 2, the spectra are connected to the Julia set of a quadratic map. In the Fibonacci case, the spectrum is related to the Julia set of an endomorphism of ℂ².

On the spectrum of the analytic generator.

A. van Daele (1975)

Mathematica Scandinavica

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