Results 31 to 40 of about 14,205 (282)

Ćirić type nonunique fixed point theorems in the frame of fuzzy metric spaces

AIMS Mathematics, 2023
The paper defines a new contractive condition within κ−orbitally complete fuzzy metric spaces (Θ,M,T), as well as fixed point theorems for single-valued and multi-valued function on Θ which is not necessarily continuous.
Tatjana Došenović , Dušan Rakić , Stojan Radenović , Biljana Carić   +3 more
doaj   +1 more source

Convergence analysis of a family of robust Kalman filters based on the contraction principle

, 2017
In this paper we analyze the convergence of a family of robust Kalman filters. For each filter of this family the model uncertainty is tuned according to the so called tolerance parameter.
Zorzi, Mattia
core   +1 more source

Graphical approach to the study of fixed point results involving hybrid contractions

Results in Control and Optimization
In this work, a new class of general contractive mappings, with the name Jaggi-Suzuki-type hybrid (K-α-ϕ)-contractive mapping is discussed in metric space equipped with a graph and new criteria for which the mapping is a Picard operator are studied.
Jamilu Abubakar Jiddah, Mohammed Shehu Shagari   +1 more
doaj   +1 more source

Fixed Point Index for Simulation Mappings and Applications

Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2023
In this paper, we construct the fixed point index for a class of contractive mapping defined by a simulation mapping and a measure of noncompact-ness noted by Zµ− contraction maps.
Benmezaï Abdelhamid, Hammache Karima, Melouane Nassima   +2 more
doaj   +1 more source

Self-adjoint Lyapunov variables, temporal ordering and irreversible representations of Schroedinger evolution

, 2009
In non relativistic quantum mechanics time enters as a parameter in the Schroedinger equation. However, there are various situations where the need arises to view time as a dynamical variable.
Busch P., Busch P., Duren P. L., Egusquiza I. L., Hoffman K., Holevo A., Koosis P., Lax P. D., Nagy B. Sz., Nikol’skiĭ N. K., Paley R. E. A. C., Pauli W., Prigogine I., Rosenblum M., Y. Strauss   +14 more
core   +1 more source

A Comparative Study of Cerebral Oxygenation During Exercise in Hemodialysis and Peritoneal Dialysis Patients

Therapeutic Apheresis and Dialysis, EarlyView.
ABSTRACT Introduction Cognitive impairment and exercise intolerance are common in dialysis patients. Cerebral perfusion and oxygenation play a major role in both cognitive function and exercise execution; HD session per se aggravates cerebral ischemia in this population. This study aimed to compare cerebral oxygenation and perfusion at rest and in mild
Marieta P. Theodorakopoulou, Konstantina Dipla, Danai Faitatzidou, Fotini Iatridi, Areti Georgiou, Artemios Karagiannidis, Erasmia Sampani, Chrysostomos Dimitriadis, Aggelos Koutlas, Andreas Zafeiridis, Pantelis Sarafidis   +10 more
wiley   +1 more source

Partial metric spaces with negative distances and fixed point theorems [PDF]

, 2015
In this paper we consider partial metric spaces in the sense of O'Neill. We introduce the notions of strong partial metric spaces and Cauchy functions.
Assaf, Samer, Pal, Koushik
core  

Phosphatidylinositol 4‐kinase as a target of pathogens—friend or foe?

FEBS Letters, EarlyView.
This graphical summary illustrates the roles of phosphatidylinositol 4‐kinases (PI4Ks). PI4Ks regulate key cellular processes and can be hijacked by pathogens, such as viruses, bacteria and parasites, to support their intracellular replication. Their dual role as essential host enzymes and pathogen cofactors makes them promising drug targets.
Ana C. Mendes, Guilherme M. Azevedo, Amanda P. Barcellos, Diana Bahia   +3 more
wiley   +1 more source

Topological radical of Banach module

, 2016
We introduce the concept of topological radical of a Banach module. This closed submodule have two description: the as the intersection of ranges of maximal contractive monomorphism (from outside) and as the union of ranges of small morphisms (from ...
Aristov, Oleg
core   +1 more source

Disordered but rhythmic—the role of intrinsic protein disorder in eukaryotic circadian timing

FEBS Letters, EarlyView.
Unstructured domains known as intrinsically disordered regions (IDRs) are present in nearly every part of the eukaryotic core circadian oscillator. IDRs enable many diverse inter‐ and intramolecular interactions that support clock function. IDR conformations are highly tunable by post‐translational modifications and environmental conditions, which ...
Emery T. Usher, Jacqueline F. Pelham
wiley   +1 more source