Zobrazeno 1 - 10
of 894
pro vyhledávání: '"A. Herrejón"'
We present new results regarding calibers in the function spaces $C_p(X)$. Our main theorem is that $C_p(X)$ is strongly \v{S}anin whenever $X$ is a submetrizable space; this improves an earlier result due to Tkachuk: $C_p(X)$ is \v{S}anin whenever $
Externí odkaz:
http://arxiv.org/abs/2403.18027
Autor:
Jiménez-Flores, Carlos David, Ríos-Herrejón, Alejandro, Rojas-Sánchez, Alejandro Darío, Tomita, Artur Hideyuki, Tovar-Acosta, Elmer Enrique
The class of SHD spaces was recently introduced in [12]. The first part of this paper focuses on answering most of the questions presented in that article. For instance, we exhibit an example of a non-SHD Tychonoff space $X$ such that $\mathscr{F}[X]
Externí odkaz:
http://arxiv.org/abs/2311.16558
Autor:
Jiménez-Flores, Carlos David, Ríos-Herrejón, Alejandro, Rojas-Sánchez, Alejandro Darío, Tovar-Acosta, Elmer Enrique
We say that a topological space $X$ is selectively highly divergent (SHD) if for every sequence of non-empty open sets $\{U_n\mid n\in\mathbb{N} \}$ of $X$, we can find $x_n\in U_n$ such that the sequence $\{x_n \}_{n\in\mathbb{N}}$ has no convergent
Externí odkaz:
http://arxiv.org/abs/2307.11992
Autor:
Ríos-Herrejón, Alejandro
In this paper we obtain new results regarding the chain conditions in the Pixley-Roy hyperspaces $\mathscr{F}[X]$. For example, if $c(X)$ and $R(X)$ denote the cellularity and weak separation number of $X$ (see Section~[4]) and we define the cardinal
Externí odkaz:
http://arxiv.org/abs/2304.13113
We show that the definition of caliber given by Engelking in R. Engelking, "General topology", Sigma series in pure mathematics, Heldermann, vol. 6, 1989, which we will call caliber*, differs from the traditional notion of this concept in some cases
Externí odkaz:
http://arxiv.org/abs/2302.12408
For a Tychonoff space $X$, the lattice $\mathscr U_X$ was introduced in L.A. P\'erez-Morales, G. Delgadillo-Pi\~n\'on, and R. Pichardo-Mendoza, "The lattice of uniform topologies on $C(X)$", Questions and Answers in General Topology, 39 (2021), 65-71
Externí odkaz:
http://arxiv.org/abs/2302.12404
Autor:
Cuauhtémoc Sáenz-Romero, Verónica Osuna-Vallejo, Patricia Herrejón-Calderón, Legna A. Pérez-Cruz, M. Guadalupe Joaquín-Juan, Ana Laura Cruzado-Vargas, Gregory A. O’Neill, Ana Gabriela Zacarías-Correa, Gyorgy E. Manzanilla-Quijada, Roberto Lindig-Cisneros, Arnulfo Blanco-García, Ángel R. Endara-Agramont, Leonel Lopez-Toledo
Publikováno v:
Frontiers in Forests and Global Change, Vol 7 (2024)
Climate change projections suggest a precarious future for the Monarch butterfly (Danaus plexippus) as the suitable climatic habitat of its exclusive overwintering host Abies religiosa (oyamel, Sacred fir, a conifer endemic to Mexico) inside the Mona
Externí odkaz:
https://doaj.org/article/ea3ea5ded27b463795c48d1009069fdb
Using Software Product Lines to Create Blockchain Products: Application to Supply Chain Traceability
In recent years, blockchain has been growing rapidly from a niche technology to a promising solution for many sectors, due to its unique properties that empower the design of innovative applications. Nevertheless, the development of blockchain applic
Externí odkaz:
http://arxiv.org/abs/2208.01497
We study the class of first-countable Lindel\"of scattered spaces, or "FLS" spaces. While every $T_3$ FLS space is homeomorphic to a scattered subspace of $\mathbb Q$, the class of $T_2$ FLS spaces turns out to be surprisingly rich. Our investigation
Externí odkaz:
http://arxiv.org/abs/2207.09489
Autor:
Ríos-Herrejón, Alejandro
In this paper we prove that if $\kappa$ is a singular cardinal with uncountable cofinality, then every power of a given topological space with precaliber $\kappa$ has precaliber $\kappa$ as well. Furthermore, if $\{X_\alpha : \alpha<\lambda\}$ is a f
Externí odkaz:
http://arxiv.org/abs/2207.02444