AbstractThis paper deals with Volterra perturbations of normal operators in a separable Hilbert space. Invertibility conditions and estimates for the norm of the inverse operators are established. In addition, bounds for the spectrum are suggested. Applications to integral, integro-differential, and matrix operators are discussed
AbstractLet H, K be self-adjoint operators on a Hilbert space. Kato's Invariance Principle (T. Kato,...
International audienceThe asymptotic distribution of eigenvalues of self-adjoint differential operat...
We consider perturbations, depending on a small parameter lambda, of a non-invertible differential o...
"Operator Functions and Localization of Spectra" is the first book that presents a systematic exposi...
Non-self adjoint operators describe problems in physics and computational sciences which lack symmet...
Let A be a selfadjoint operator in a Hilbert space-9. Its rank one perturbations A + r(., co)co, T E...
AbstractAn improvement of a perturbation theory lemma by M. M. Skriganov which gives an upper bound ...
AbstractLet 4 be a selfadjoint operator on a Hilbert space H. The results in this paper provide nece...
Thesis (M.A.)--Boston UniversityPLEASE NOTE: Boston University Libraries did not receive an Authoriz...
Paper presented at the 4th Strathmore International Mathematics Conference (SIMC 2017), 19 - 23 June...
AbstractLet H be an invertible self-adjoint operator on a finite dimensional Hilbert space X. A line...
The book presents an introduction to the geometry of Hilbert spaces and operator theory, targeting g...
AbstractNonself-adjoint, nondissipative perturbations of bounded self-adjoint operators with real pu...
AbstractWe discuss the following problem: How can the spectrum σ(A) of a linear operator A be change...
AbstractConsider a unitary operator U0 acting on a complex separable Hilbert space H. In this paper ...
AbstractLet H, K be self-adjoint operators on a Hilbert space. Kato's Invariance Principle (T. Kato,...
International audienceThe asymptotic distribution of eigenvalues of self-adjoint differential operat...
We consider perturbations, depending on a small parameter lambda, of a non-invertible differential o...
"Operator Functions and Localization of Spectra" is the first book that presents a systematic exposi...
Non-self adjoint operators describe problems in physics and computational sciences which lack symmet...
Let A be a selfadjoint operator in a Hilbert space-9. Its rank one perturbations A + r(., co)co, T E...
AbstractAn improvement of a perturbation theory lemma by M. M. Skriganov which gives an upper bound ...
AbstractLet 4 be a selfadjoint operator on a Hilbert space H. The results in this paper provide nece...
Thesis (M.A.)--Boston UniversityPLEASE NOTE: Boston University Libraries did not receive an Authoriz...
Paper presented at the 4th Strathmore International Mathematics Conference (SIMC 2017), 19 - 23 June...
AbstractLet H be an invertible self-adjoint operator on a finite dimensional Hilbert space X. A line...
The book presents an introduction to the geometry of Hilbert spaces and operator theory, targeting g...
AbstractNonself-adjoint, nondissipative perturbations of bounded self-adjoint operators with real pu...
AbstractWe discuss the following problem: How can the spectrum σ(A) of a linear operator A be change...
AbstractConsider a unitary operator U0 acting on a complex separable Hilbert space H. In this paper ...
AbstractLet H, K be self-adjoint operators on a Hilbert space. Kato's Invariance Principle (T. Kato,...
International audienceThe asymptotic distribution of eigenvalues of self-adjoint differential operat...
We consider perturbations, depending on a small parameter lambda, of a non-invertible differential o...
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