arXiv subjects

Athmane Ferradi

Publications and source records attributed to Athmane Ferradi.

5 recordsLinked to original sources

arXiv2025

Tensorial representations of positive weakly (q,r)-dominated multilinear operators

We introduce and study the class of positive weakly (q,r)-dominated multilinear operators between Banach lattices. This notion extends classical domination and summability concepts to the positive multilinear setting and generates a new positive multi-ideal. A Pietsch domination theorem and a polynomial version are established. Finally, we provide a tensorial representation that yields an isometric identification with the dual of an appropriate completed tensor product.

math.FA↗

arXiv2025

Composition ideals of Lip-Linear operators and a Hilbert space characterization

In this paper, we investigate classes of Lip-linear operators constructed using the composition ideal method. We focus on two fundamental linear operator ideals, $p$-summing and strongly $p$-summing operators, and extend them to define the corresponding classes of Lip-linear operators. Several key results are established, including a characterization theorem for Hilbert spaces originally due to Kwapień. Specifically, we show that a Banach space $F$ is isomorphic to a Hilbert space if and only if every factorable strongly $p$-summing Lip-linear operator with values in $F$ is Cohen strongly $p$-summing.

math.FA↗

arXiv2025

Lip-Linear operators and their connection to Lipschitz tensor products

The linear operators defined on the Lipschitz projective tensor product of X and E motivate the study of a distinct class of operators acting on the cartesian produc X E. This class, denoted by LipL(X E;F), combines Lipschitz and linear properties, forming an intermediate framework between bilinear operators and two-Lipschitz operators. We establish an identification between this space and L(X E;F), which also links it to the space of bilinear operators B(AE(X) E;F). Furthermore, we extend summability concepts within this category, with a particular focus on integral and dominated (p;q)-summing operators

math.FA↗

arXiv2024

Positive ideals of multilinear operators

We introduce and explore the concept of positive ideals for both linear and multilinear operators between Banach lattices. This paper delineates the fundamental principles of these new classes and provides techniques for constructing positive multi-ideals from given positive ideals. Furthermore, we present an example of a positive multi-ideal by introducing a new class, referred to as positive (p1,...,pm;r)-dominated multilinear operators. We establish a natural analogue of the Pietsch domination theorem and Kwapien's factorization theorem within this class.

math.FA↗

arXiv2023

New results on MS-Lipschitz summing operators

This paper focuses on the study of MS-Lipschitz p-summing operators, which were initially defined by the authors in 14. Our objective is to establish relationships between T and its linearizations, namely T and T. Additionally, we extend our investigation by introducing a new definition in the category of Lipschitz mappings defined on metric spaces, known as MS-Cohen Lipschitz p-summing. We provide several results and characterizations for this new concept.

math.FA↗