Results 41 to 50 of about 2,335,070 (368)

Multiplication operators on the Banach algebra of bounded Φ-variation functions on compact subsets of ℂ

Demonstratio Mathematica, 2022
Let AΦ(K){{\mathbb{A}}}_{\Phi }\left({\bf{K}}) be the Banach algebra of bounded Φ\Phi -variation functions defined on a compact set K{\bf{K}} in the complex plane, hh a function defined on K{\bf{K}}, and Mh{M}_{h} a multiplication operator induced by hh.
Bracamonte Mireya, Ereú Jurancy, Marchan Luz   +2 more
doaj   +1 more source

Approximating compact and weakly compact operators [PDF]

Proceedings of the American Mathematical Society, 1961
REMARKS. To place the theorem in context consider all operators as mapping the Banach space X into the Banach space Y and consider the topology a to be that of almost uniform convergence on the unit ball of X utilizing the norm topology on Y. The second theorem gives a similar result for weakly compact operators.
openaire   +1 more source

Bounds on the negative eigenvalues of Laplacians on finite metric graphs [PDF]

, 2013
For a self--adjoint Laplace operator on a finite, not necessarily compact, metric graph lower and upper bounds on each of the negative eigenvalues are derived.
Hussein, Amru
core   +1 more source

Compact Weighted Composition Operators and Multiplication Operators between Hardy Spaces

Abstract and Applied Analysis, 2008
We estimate the essential norm of a compact weighted composition operator 𝑢𝐶𝜑 acting between different Hardy spaces of the unit ball in ℂ𝑁. Also we will discuss a compact multiplication operator between Hardy spaces.
Sei-Ichiro Ueki, Luo Luo
doaj   +1 more source

New Characterizations of the Jeribi Essential Spectrum

International Journal of Analysis and Applications, 2023
In this paper, we give several characterizations of the Jeribi essential spectrum of a bounded linear operator defined on a Banach space by using the notion of almost weakly compact operators.
Belabbaci Chafika
doaj   +1 more source

Reduced spectral synthesis and compact operator synthesis

, 2019
We introduce and study the notion of reduced spectral synthesis, which unifies the concepts of spectral synthesis and uniqueness in locally compact groups.
Shulman, V. S., Todorov, I. G., Turowska, L.   +2 more
core   +1 more source

The First Eigenvalue of the Dirac Operator on Compact Spin Symmetric Spaces [PDF]

, 2005
We give a formula for the first eigenvalue of the Dirac operator acting on spinor fields of a spin compact irreducible symmetric space $G/K$
Cahen, Cahen, Jean-Louis Milhorat, Parthasarathy   +3 more
core   +5 more sources

Lipschitz Operators Associated with Weakly $p$-Compact and Unconditionally $p$-Compact Sets

Journal of Advanced Research in Natural and Applied Sciences
The study introduces different categories of Lipschitz operators linked with weakly $p$-compact and unconditionally $p$-compact sets. It explores some properties of these operator classes derived from linear operators associated with these sets and ...
Ramazan İnal, Ayşegül Keten Çopur
doaj   +1 more source

KARAKTERISTIK OPERATOR PARANORMAL- * QUASI

Jurnal Lebesgue, 2022
Given Hilbert space  H  over the fields of  . This study aimed to investigate the paranormal- * quasi operators and their properties in Hilbert space.
Gunawan Gunawan, Erni Widiyastuti
doaj   +1 more source

Gohberg lemma, compactness, and essential spectrum of operators on compact Lie groups

, 2013
In this paper we prove a version of the Gohberg lemma on compact Lie groups giving an estimate from below for the distance from a given operator to the set of compact operators on compact Lie groups.
Dasgupta, Aparajita, Ruzhansky, Michael
core   +1 more source