Results 31 to 40 of about 328 (159)

\(\beta\)-Menger and \(\beta\)-Hurewicz spaces

Hacettepe Journal of Mathematics and Statistics, 2021
Summary: Recently, some papers on weaker forms of classical covering properties of Hurewicz and Menger have been published. In this paper, using the covers formed by \(\beta\)-open sets, we introduce and study the properties of \(\beta\)-Menger and \(\beta\)-Hurewicz topological spaces. We give counterexamples that show the interrelations between those
openaire   +3 more sources

On the existence and uniqueness problems of solutions for set-valued and single-valued nonlinear operator equations in probabilistic normed spaces

International Journal of Mathematics and Mathematical Sciences, 1994
In this paper, we introduce the concept of more general probabilistic contractors in probabilistic normed spaces and show the existence and uniqueness of solutions for set-valued and single-valued nonlinear operator equations in Menger probabilistic ...
Shih-Sen Chang, Yeol Je Cho, Fan Wang
doaj   +1 more source

Products of Menger spaces: A combinatorial approach

Annals of Pure and Applied Logic, 2017
We construct Menger subsets of the real line whose product is not Menger in the plane. In contrast to earlier constructions, our approach is purely combinatorial. The set theoretic hypothesis used in our construction is far milder than earlier ones, and holds in all but the most exotic models of real set theory.
Szewczak, Piotr, Tsaban, Boaz
openaire   +2 more sources

How much sampling is enough? Four decades of understorey bird mist‐netting across Amazonia define the minimum effort to uncover species assemblage structure

Ibis, EarlyView.
Mist‐net sampling comprises a key methodological component of assemblage‐wide avifaunal studies, particularly in the understorey of closed‐canopy tropical forests. To investigate mist‐net bird captures and species assemblage structure, we compiled data from 312 sites across the Pan‐Amazon.
Pilar L. Maia‐Braga, Anderson S. Bueno, Richard G. Davies, Marina F. A. Maximiano, Torbjørn Haugaasen, Marina Anciães, John G. Blake, Bette A. Loiselle, Sergio H. Borges, Juliana Menger, Sidnei Dantas, Ramiro D. Melinski, Fernando H. T. de Abreu, Roberta L. Boss, Carlos A. Peres   +14 more
wiley   +1 more source

Exploring multivalued probabilistic ψ-contractions with orbits in b-Menger spaces

Vojnotehnički Glasnik
Introduction/purpose: The paper presents a novel approach to certain well-established fixed point theorems for multivalued probabilistic contractions in b-Menger spaces, leveraging the boundedness of the orbits.
Youssef Achtoun, Stojan Radenović, Ismail Tahiri, Mohammed Lamarti Sefian   +3 more
doaj   +1 more source

On Probabilistic Alpha-Fuzzy Fixed Points and Related Convergence Results in Probabilistic Metric and Menger Spaces under Some Pompeiu-Hausdorff-Like Probabilistic Contractive Conditions

Journal of Function Spaces, 2015
In the framework of complete probabilistic metric spaces and, in particular, in probabilistic Menger spaces, this paper investigates some relevant properties of convergence of sequences to probabilistic α-fuzzy fixed points under some types of ...
M. De la Sen
doaj   +1 more source

Functional-Type Caristi–Kirk Theorem on Menger Space and Application

Journal of Mathematics, 2020
In this paper, we extend Caristi’s fixed point theorem in metric spaces to probabilistic metric spaces, and also, we prove some common fixed point theorems for a pair of mappings satisfying a system of Caristi-type contractions in the setting of a Menger
Soumia Chaira, Mohammed Dahmouni, Abderrahim Eladraoui, Mustapha Kabil   +3 more
doaj   +1 more source

Fréchet differentiation between Menger probabilistic normed spaces [PDF]

Proyecciones (Antofagasta), 2017
In this paper, we define and study Menger weakly and strongly P-convergent sequences and then Menger probabilistic continuity. We also display Frechet differentiation of nonlinear operators between Menger probabilistic normed spaces.
openaire   +2 more sources

Fine‐scale patterns of genetic structure in three species of forest birds reveal dynamic Pleistocene history within an Amazonian interfluve

Ibis, EarlyView.
Phylogeographical studies of Amazonian birds have revealed large intraspecific diversity, even within recognized areas of endemism. To understand the origin and organization of Amazonian diversity, including the influence of current and historical landscapes, we need to evaluate fine‐scale patterns of genetic diversity in relation to detailed ...
Affonso Henrique Nascimento de Souza, Camila Duarte Ritter, João Marcos Guimarães Capurucho, Juliana Menger, Camila Cherem Ribas   +4 more
wiley   +1 more source

Amacrine cell inputs to OFF midget ganglion cells in macaque retina

The Journal of Physiology, EarlyView.
Abstract figure legend The goal of this study was to explain the findings from physiological studies that OFF midget ganglion cells had larger receptive field centers than expected from their dendritic field diameters. First, we confirmed that OFF mRGCs (OFF MGC) receive input from diffuse bipolar cells (DB) as well as OFF midget bipolar cells (FMB ...
David W. Marshak, Andrea S. Bordt, Emma R. Yang, Joel N. Yearick, Marcus Mazzaferri, James A. Kuchenbecker, Judith Mosinger Ogilvie, Sara S. Patterson, Jay Neitz   +8 more
wiley   +1 more source