2025/12/6
Kamal Fallahi

Kamal Fallahi

Academic rank: Associate Professor
ORCID: 0000-0003-3400-4424
Education: PhD.
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Faculty: Faculty of Science
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E-mail: k.fallahi [at] uok.ac.ir
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Research

Title
WEAKLY p-SUMMABLE SEQUENCES AND FIXED POINT THEORY IN BANACH LATTICES
Type
JournalPaper
Keywords
Right topology, fixed point property, weak orthogonality, Dunford-Pettis set, almost Dunford-Pettis set.
Year
2025
Journal Fixed Point Theory
DOI
Researchers Halimeh Ardakani ، Kamal Fallahi ، Fatemeh Norouzi

Abstract

Using weakly p-summable and Dunford-Pettis (resp. weakly p-summable and almost Dunford-Pettis) sequences, some geometric properties on Banach lattices are studied. Moreover, by the concept of relatively compact Dunford-Pettis property (briefly, DPrcP) and strong DPrcP, Banach lattices in which some of these properties coincide are characterized. As an application, Banach lattices with the Right fixed point property of order p are considered. In particular, it is established that for a Banach space X and a suitable Banach lattice F , a Banach lattice M ⊂K(X; F ) has the Right fixed point property of order p (resp. strong Right fixed point property of order p) if each evaluation operator y∗ on M is Dunford-Pettis p-convergent (resp. almost Dunford-Pettis p-convergent), where y∗ : M ! X∗ is defined by y∗(T ) = T ∗y∗ for y∗ 2 F ∗ and T 2 M.