Results 1 to 8 of about 8 (8)

Generalized lower characteristic involving measures of non-strict singularity

Topological Algebra and its Applications, 2023
This work establishes a connection between the class of generalized lower characteristic operators and [⋅]a{\left[\cdot ]}_{a} acting on a Banach space involving measures of non-strict singularity.
Baraket Sami, Ghorbal Anis Ben, Jeribi Aref   +2 more
doaj   +1 more source

B-Fredholm elements in primitive C*-algebras

Open Mathematics, 2022
Let A{\mathcal{A}} be a unital primitive C∗\ast -algebra. This article studies the properties of the B-Fredholm elements, the B-Weyl elements and the B-Browder elements in A{\mathcal{A}}. Particularly, this article describes the B-Fredholm element as the
Kong Yingying, Jiang Lining
doaj   +1 more source

On new strong versions of Browder type theorems

Open Mathematics, 2018
An operator T acting on a Banach space X satisfies the property (UWΠ) if σa(T)∖ σSF+−$\begin{array}{} \sigma_{SF_{+}^{-}} \end{array} $(T) = Π(T), where σa(T) is the approximate point spectrum of T, σSF+−$\begin{array}{} \sigma_{SF_{+}^{-}} \end{array} $
Sanabria José, Carpintero Carlos, Rodríguez Jorge, Rosas Ennis, García Orlando   +4 more
doaj   +1 more source

On the closed range problem for composition operators on the Dirichlet space

Concrete Operators, 2019
We characterize closed range composition operators on the Dirichlet space for a particular class of composition symbols. The characterization relies on a result about Fredholm Toeplitz operators with BMO1 symbols, and with Berezin transforms of vanishing
Zorboska Nina
doaj   +1 more source

Zoochoric and hydrochoric maritime dispersal of the Opuntia monacantha (Willd.) Haw. (Cactaceae) [PDF]

Biotemas, 2012
Evolutionary adaptations in the morphology and physiology of cactus species have been associated to their mechanisms of dispersal and colonization. The dispersal mechanisms and modes of Opuntia monacantha (Willd.) Haw.
Angelo Martins Fraga, Josy Zarur de Matos, Maurício Eduardo Graipel, Maurício Lenzi, Afonso Inácio Orth   +4 more
doaj  

The index of a pair of pure states and the interacting integer quantum Hall effect

Forum of Mathematics, Sigma
We introduce the index ${\mathcal N}(\omega _1,\omega _2)$ of a pair of pure states on a unital C*-algebra, which is a generalization of the notion of the index of a pair of projections on a Hilbert space.
Sven Bachmann, Jacob Shapiro, Clément Tauber   +2 more
doaj   +1 more source

The Differences between the Effects of a Nanoformulation and a Conventional Form of Atrazine to Lettuce: Physiological Responses, Defense Mechanisms, and Nutrient Displacement. [PDF]

J Agric Food Chem, 2021
Wu J, Zhai Y, Monikh FA, Arenas-Lago D, Grillo R, Vijver MG, Peijnenburg WJGM.   +6 more
europepmc   +1 more source

Fredholmness of multiplication of a weighted composition operator with its adjoint on H2 and Aα2. [PDF]

J Inequal Appl, 2018
Haji Shaabani M.
europepmc   +1 more source