{"title":"On function spaces equipped with Isbell topology and Scott topology","authors":"Xiaoquan Xu, Meng Bao, Xiaoyuan Zhang","doi":"10.1017/S0960129523000014","DOIUrl":null,"url":null,"abstract":"Abstract In this paper, we mainly study the function spaces related to H-sober spaces. For an irreducible subset system H and \n$T_{0}$\n spaces X and Y, it is proved that the following three conditions are equivalent: (1) the Scott space \n$\\Sigma \\mathcal O(X)$\n of the lattice of all open sets of X is H-sober; (2) for every H-sober space Y, the function space \n$\\mathbb{C}(X, Y)$\n of all continuous mappings from X to Y equipped with the Isbell topology is H-sober; (3) for every H-sober space Y, the Isbell topology on \n$\\mathbb{C}(X, Y)$\n has property S with respect to H. One immediate corollary is that for a \n$T_{0}$\n space X, Y is a d-space (resp., well-filtered space) iff the function space \n$\\mathbb{C}(X, Y)$\n equipped with the Isbell topology is a d-space (resp., well-filtered space). It is shown that for any \n$T_0$\n space X for which the Scott space \n$\\Sigma \\mathcal O(X)$\n is non-sober, the function space \n$\\mathbb{C}(X, \\Sigma 2)$\n equipped with the Isbell topology is not sober. The function spaces \n$\\mathbb{C}(X, Y)$\n equipped with the Scott topology, the compact-open topology and the pointwise convergence topology are also discussed. Our study also leads to a number of questions, whose answers will deepen our understanding of the function spaces related to H-sober spaces.","PeriodicalId":49855,"journal":{"name":"Mathematical Structures in Computer Science","volume":"32 1","pages":"1099 - 1116"},"PeriodicalIF":0.4000,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Mathematical Structures in Computer Science","FirstCategoryId":"94","ListUrlMain":"https://doi.org/10.1017/S0960129523000014","RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"COMPUTER SCIENCE, THEORY & METHODS","Score":null,"Total":0}
引用次数: 1
Abstract
Abstract In this paper, we mainly study the function spaces related to H-sober spaces. For an irreducible subset system H and
$T_{0}$
spaces X and Y, it is proved that the following three conditions are equivalent: (1) the Scott space
$\Sigma \mathcal O(X)$
of the lattice of all open sets of X is H-sober; (2) for every H-sober space Y, the function space
$\mathbb{C}(X, Y)$
of all continuous mappings from X to Y equipped with the Isbell topology is H-sober; (3) for every H-sober space Y, the Isbell topology on
$\mathbb{C}(X, Y)$
has property S with respect to H. One immediate corollary is that for a
$T_{0}$
space X, Y is a d-space (resp., well-filtered space) iff the function space
$\mathbb{C}(X, Y)$
equipped with the Isbell topology is a d-space (resp., well-filtered space). It is shown that for any
$T_0$
space X for which the Scott space
$\Sigma \mathcal O(X)$
is non-sober, the function space
$\mathbb{C}(X, \Sigma 2)$
equipped with the Isbell topology is not sober. The function spaces
$\mathbb{C}(X, Y)$
equipped with the Scott topology, the compact-open topology and the pointwise convergence topology are also discussed. Our study also leads to a number of questions, whose answers will deepen our understanding of the function spaces related to H-sober spaces.
期刊介绍:
Mathematical Structures in Computer Science is a journal of theoretical computer science which focuses on the application of ideas from the structural side of mathematics and mathematical logic to computer science. The journal aims to bridge the gap between theoretical contributions and software design, publishing original papers of a high standard and broad surveys with original perspectives in all areas of computing, provided that ideas or results from logic, algebra, geometry, category theory or other areas of logic and mathematics form a basis for the work. The journal welcomes applications to computing based on the use of specific mathematical structures (e.g. topological and order-theoretic structures) as well as on proof-theoretic notions or results.