Pub Date : 2025-11-24DOI: 10.1016/j.topol.2025.109670
Allan Edley Ramos de Andrade , Northon Canevari Leme Penteado , Sergio Tsuyoshi Ura
Given G a finite group which acts on and H a normal cyclic subgroup of prime order, in [1] the authors have defined and estimated the cohomological dimension of the set of -coincidence points of an acyclic multi-valued map relative to an essential map , where X is a compact Hausdorff space and Y is a k-dimensional CW-complex. In this work we extended this result to an admissible multi-valued map and to an essential multi-valued map such that . Furthermore, we define and estimate the cohomological dimension of a coincidence set where , are two admissible multi-valued maps and N is a connected closed manifold and a homology n-sphere.
给定G是作用于Sn的有限群,H是素阶的正规循环子群,在[1]中定义并估计了非循环多值映射F:X X→Sn的(H,G)-重合点的集合a φ(F,H,G)相对于本质映射φ:X→Sn的上同调维数,其中X是紧Hausdorff空间,Y是k维cw复形。在本工作中,我们将此结果推广到一个容许多值映射F:X X Y和一个本质多值映射Φ:X X Sn,使得Ti(Φ(X))∩Φ(X)=∅,i=1,…,p。进一步,我们定义并估计了重合集a (F,Φ)的上同调维数,其中F:X × M, Φ:X × N是两个可容许的多值映射,N是连通闭流形和同调N球。
{"title":"A nonsymmetric approach to coincidences of admissible multi-valued maps","authors":"Allan Edley Ramos de Andrade , Northon Canevari Leme Penteado , Sergio Tsuyoshi Ura","doi":"10.1016/j.topol.2025.109670","DOIUrl":"10.1016/j.topol.2025.109670","url":null,"abstract":"<div><div>Given <em>G</em> a finite group which acts on <span><math><msup><mrow><mi>S</mi></mrow><mrow><mi>n</mi></mrow></msup></math></span> and <em>H</em> a normal cyclic subgroup of prime order, in <span><span>[1]</span></span> the authors have defined and estimated the cohomological dimension of the set <span><math><msub><mrow><mi>A</mi></mrow><mrow><mi>φ</mi></mrow></msub><mo>(</mo><mi>F</mi><mo>,</mo><mi>H</mi><mo>,</mo><mi>G</mi><mo>)</mo></math></span> of <span><math><mo>(</mo><mi>H</mi><mo>,</mo><mi>G</mi><mo>)</mo></math></span>-coincidence points of an acyclic multi-valued map <span><math><mi>F</mi><mo>:</mo><mi>X</mi><mo>⊸</mo><mi>Y</mi></math></span> relative to an essential map <span><math><mi>φ</mi><mo>:</mo><mi>X</mi><mo>→</mo><msup><mrow><mi>S</mi></mrow><mrow><mi>n</mi></mrow></msup></math></span>, where <em>X</em> is a compact Hausdorff space and <em>Y</em> is a <em>k</em>-dimensional CW-complex. In this work we extended this result to an admissible multi-valued map <span><math><mi>F</mi><mo>:</mo><mi>X</mi><mo>⊸</mo><mi>Y</mi></math></span> and to an essential multi-valued map <span><math><mi>Φ</mi><mo>:</mo><mi>X</mi><mo>⊸</mo><msup><mrow><mi>S</mi></mrow><mrow><mi>n</mi></mrow></msup></math></span> such that <span><math><msup><mrow><mi>T</mi></mrow><mrow><mi>i</mi></mrow></msup><mo>(</mo><mi>Φ</mi><mo>(</mo><mi>x</mi><mo>)</mo><mo>)</mo><mo>∩</mo><mi>Φ</mi><mo>(</mo><mi>x</mi><mo>)</mo><mo>=</mo><mo>∅</mo><mo>,</mo><mspace></mspace><mi>i</mi><mo>=</mo><mn>1</mn><mo>,</mo><mo>…</mo><mo>,</mo><mi>p</mi></math></span>. Furthermore, we define and estimate the cohomological dimension of a coincidence set <span><math><mi>A</mi><mo>(</mo><mi>F</mi><mo>,</mo><mi>Φ</mi><mo>)</mo></math></span> where <span><math><mi>F</mi><mo>:</mo><mi>X</mi><mo>⊸</mo><mi>M</mi></math></span>, <span><math><mi>Φ</mi><mo>:</mo><mi>X</mi><mo>⊸</mo><mi>N</mi></math></span> are two admissible multi-valued maps and <em>N</em> is a connected closed manifold and a homology <em>n</em>-sphere.</div></div>","PeriodicalId":51201,"journal":{"name":"Topology and its Applications","volume":"378 ","pages":"Article 109670"},"PeriodicalIF":0.5,"publicationDate":"2025-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145618328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-20DOI: 10.1016/j.topol.2025.109667
Richard N. Ball , Anthony W. Hager , Joanne Walters-Wayland
We show that classical continuous convergence has an elegant and powerful formulation in , the W-object of real functions on the locale L. Here W is the category of divisible archimedean ℓ-groups with designated weak order units, and cW is the category of W-objects equipped with a suitable convergence structure, together with the continuous W-homomorphisms. We exhibit an adjunction between the functor , which assigns to the locale L the cW-object equipped with its continuous convergence, and its left adjoint , which assigns to a given cW-object its frame of cW-kernels, i.e., its frame of convergence closed W-kernels. A significant attribute of the adjunction is that its unit is the Cauchy completion.
The suitable convergences, here termed admissibleW-convergences, include the classical convergences, are Hausdorff, and are all coarser than relative uniform convergence and finer than α-convergence. (Pointfree pointwise convergence, however, is not admissible.) We show that the coarse admissible convergences on a W-object G are in bijective correspondence with the dense nuclei on the frame of W-kernels of G. Finally, we show that the κ-closure nucleus on , i.e., the closure of the W-kernels of G under κ-joins, corresponds to the coarse admissible W-convergence on G whose Cauchy completion is the κ-repletion of G.
{"title":"From λ-hollow frames to λ-repletions in W: III. Continuous convergence in RL","authors":"Richard N. Ball , Anthony W. Hager , Joanne Walters-Wayland","doi":"10.1016/j.topol.2025.109667","DOIUrl":"10.1016/j.topol.2025.109667","url":null,"abstract":"<div><div>We show that classical continuous convergence has an elegant and powerful formulation in <span><math><mi>R</mi><mi>L</mi></math></span>, the <strong>W</strong>-object of real functions on the locale <em>L</em>. Here <strong>W</strong> is the category of divisible archimedean <em>ℓ</em>-groups with designated weak order units, and <strong>cW</strong> is the category of <strong>W</strong>-objects equipped with a suitable convergence structure, together with the continuous <strong>W</strong>-homomorphisms. We exhibit an adjunction between the functor <span><math><msub><mrow><mi>R</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>, which assigns to the locale <em>L</em> the <strong>cW</strong>-object <span><math><mi>R</mi><mi>L</mi></math></span> equipped with its continuous convergence, and its left adjoint <span><math><msub><mrow><mi>K</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>, which assigns to a given <strong>cW</strong>-object its frame of <strong>cW</strong>-kernels, i.e., its frame of convergence closed <strong>W</strong>-kernels. A significant attribute of the adjunction is that its unit is the Cauchy completion.</div><div>The suitable convergences, here termed <em>admissible</em> <strong>W</strong><em>-convergences</em>, include the classical convergences, are Hausdorff, and are all coarser than relative uniform convergence and finer than <em>α</em>-convergence. (Pointfree pointwise convergence, however, is not admissible.) We show that the coarse admissible convergences on a <strong>W</strong>-object <em>G</em> are in bijective correspondence with the dense nuclei on the frame <span><math><mi>K</mi><mi>G</mi></math></span> of <strong>W</strong>-kernels of <em>G</em>. Finally, we show that the <em>κ</em>-closure nucleus on <span><math><mi>K</mi><mi>G</mi></math></span>, i.e., the closure of the <strong>W</strong>-kernels of <em>G</em> under <em>κ</em>-joins, corresponds to the coarse admissible <strong>W</strong>-convergence on <em>G</em> whose Cauchy completion is the <em>κ</em>-repletion of <em>G</em>.</div></div>","PeriodicalId":51201,"journal":{"name":"Topology and its Applications","volume":"377 ","pages":"Article 109667"},"PeriodicalIF":0.5,"publicationDate":"2025-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145617865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-19DOI: 10.1016/j.topol.2025.109665
Phan Hoàng Chơn , Nguyễn Đặng Hồ Hải
N. Kuhn and C. Lloyd conjectured in [8] that the rank of the mod-2 Morava K-theory of the real Grassmannian manifolds could be written as a sum of products of binomial coefficients. The conjecture is easy for and was already checked by Kuhn and Lloyd for . The aim of this paper is to check this conjecture for the case .
n . Kuhn和C. Lloyd在[8]中推测,实格拉斯曼流形的mod2 Morava K-理论K(n)的秩可以写成二项式系数积的和。这个猜想在d=1时很容易,在d=2时已经被Kuhn和Lloyd验证过了。本文的目的是在d=3的情况下检验这个猜想。
{"title":"On the Morava K-theory of the real Grassmannian Gr3(Rm)","authors":"Phan Hoàng Chơn , Nguyễn Đặng Hồ Hải","doi":"10.1016/j.topol.2025.109665","DOIUrl":"10.1016/j.topol.2025.109665","url":null,"abstract":"<div><div>N. Kuhn and C. Lloyd conjectured in <span><span>[8]</span></span> that the rank of the mod-2 Morava K-theory <span><math><mi>K</mi><msup><mrow><mo>(</mo><mi>n</mi><mo>)</mo></mrow><mrow><mo>⁎</mo></mrow></msup></math></span> of the real Grassmannian manifolds <span><math><mi>G</mi><msub><mrow><mi>r</mi></mrow><mrow><mi>d</mi></mrow></msub><mo>(</mo><msup><mrow><mi>R</mi></mrow><mrow><mi>m</mi></mrow></msup><mo>)</mo></math></span> could be written as a sum of products of binomial coefficients. The conjecture is easy for <span><math><mi>d</mi><mo>=</mo><mn>1</mn></math></span> and was already checked by Kuhn and Lloyd for <span><math><mi>d</mi><mo>=</mo><mn>2</mn></math></span>. The aim of this paper is to check this conjecture for the case <span><math><mi>d</mi><mo>=</mo><mn>3</mn></math></span>.</div></div>","PeriodicalId":51201,"journal":{"name":"Topology and its Applications","volume":"377 ","pages":"Article 109665"},"PeriodicalIF":0.5,"publicationDate":"2025-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145617866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-17DOI: 10.1016/j.topol.2025.109664
Ziteng Ma
We prove that a generic diffeomorphism of a closed surface is N-expansive for some positive integer N if and only if it is Anosov. Consequently, every closed surface different from the torus exhibits a residual subset of diffeomorphisms, none of which is N-expansive. This contrasts with a result of Artigue [2].
{"title":"N-expansiveness of generic surface diffeomorphisms","authors":"Ziteng Ma","doi":"10.1016/j.topol.2025.109664","DOIUrl":"10.1016/j.topol.2025.109664","url":null,"abstract":"<div><div>We prove that a <span><math><msup><mrow><mi>C</mi></mrow><mrow><mn>1</mn></mrow></msup></math></span> generic diffeomorphism of a closed surface is <em>N</em>-expansive for some positive integer <em>N</em> if and only if it is Anosov. Consequently, every closed surface different from the torus exhibits a residual subset of <span><math><msup><mrow><mi>C</mi></mrow><mrow><mn>1</mn></mrow></msup></math></span> diffeomorphisms, none of which is <em>N</em>-expansive. This contrasts with a result of Artigue <span><span>[2]</span></span>.</div></div>","PeriodicalId":51201,"journal":{"name":"Topology and its Applications","volume":"377 ","pages":"Article 109664"},"PeriodicalIF":0.5,"publicationDate":"2025-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145571374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-14DOI: 10.1016/j.topol.2025.109661
Chunxu Ji , Kaiyun Wang
This paper focuses on the quasi covering dimension of topological spaces. We prove that a topological space and its Kolmogorov quotient space have the same quasi covering dimension. Subsequently, for a finite space , we show that its quasi covering dimension , where is the set of all maximal elements of X under the specialization order. Furthermore, we investigate the subspace theorems of quasi covering dimension of finite topological spaces and give an example presenting that the Cartesian product theorem does not hold in general. Finally, we discuss the relationships between the quasi covering dimension of topological spaces and that of frames.
{"title":"Quasi covering dimension of topological spaces","authors":"Chunxu Ji , Kaiyun Wang","doi":"10.1016/j.topol.2025.109661","DOIUrl":"10.1016/j.topol.2025.109661","url":null,"abstract":"<div><div>This paper focuses on the quasi covering dimension of topological spaces. We prove that a topological space and its Kolmogorov quotient space have the same quasi covering dimension. Subsequently, for a finite <span><math><msub><mrow><mi>T</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span> space <span><math><mo>(</mo><mi>X</mi><mo>,</mo><mi>τ</mi><mo>)</mo></math></span>, we show that its quasi covering dimension <span><math><mi>d</mi><mi>i</mi><msub><mrow><mi>m</mi></mrow><mrow><mi>q</mi></mrow></msub><mo>(</mo><mi>X</mi><mo>,</mo><mi>τ</mi><mo>)</mo><mo>=</mo><mi>max</mi><mo></mo><mo>{</mo><mi>w</mi><mi>i</mi><mi>d</mi><mi>t</mi><mi>h</mi><mo>(</mo><mo>↓</mo><mspace></mspace><mi>x</mi><mo>)</mo><mo>|</mo><mi>x</mi><mo>∈</mo><mrow><mi>Max</mi></mrow><mo>(</mo><mi>X</mi><mo>)</mo><mo>}</mo><mo>−</mo><mn>1</mn></math></span>, where <span><math><mrow><mi>Max</mi></mrow><mo>(</mo><mi>X</mi><mo>)</mo></math></span> is the set of all maximal elements of <em>X</em> under the specialization order. Furthermore, we investigate the subspace theorems of quasi covering dimension of finite topological spaces and give an example presenting that the Cartesian product theorem does not hold in general. Finally, we discuss the relationships between the quasi covering dimension of topological spaces and that of frames.</div></div>","PeriodicalId":51201,"journal":{"name":"Topology and its Applications","volume":"377 ","pages":"Article 109661"},"PeriodicalIF":0.5,"publicationDate":"2025-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145571264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-13DOI: 10.1016/j.topol.2025.109662
Zhengbo Fang, Lei Mou
In this paper, we mainly prove that any countable product of ordinals is dually discrete. To get the result, we use the method which is called reverse induction by Patrakeev in [5].
{"title":"Any countable product of ordinals is dually discrete","authors":"Zhengbo Fang, Lei Mou","doi":"10.1016/j.topol.2025.109662","DOIUrl":"10.1016/j.topol.2025.109662","url":null,"abstract":"<div><div>In this paper, we mainly prove that any countable product of ordinals is dually discrete. To get the result, we use the method which is called reverse induction by Patrakeev in <span><span>[5]</span></span>.</div></div>","PeriodicalId":51201,"journal":{"name":"Topology and its Applications","volume":"377 ","pages":"Article 109662"},"PeriodicalIF":0.5,"publicationDate":"2025-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145571373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-13DOI: 10.1016/j.topol.2025.109663
Abhishek
In 1971, R. D. Holmes and A. T.-M. Lau generalized the class of nonexpansive action by introducing the notion of asymptotically nonexpansive action of a semitopological semigroup S on a nonempty subset K of a Banach space U. They proved that a right reversible asymptotically nonexpansive action of a semitopological semigroup S on C has a common fixed point in C whenever C is a nonempty compact convex set having the property (B) in a Banach space U. In 2018, Aminpour et al. introduced the notion of strong asymptotically nonexpansive action of a semitopological semigroup S on a nonempty subset K of a Banach space U. Aminpour et al. gave an analogous result to R. D. Holmes and A. T.-M. Lau without the property (B). Without the assumption of property (B), we prove that a left reversible strong asymptotically nonexpansive action of a semitopological semigroup S on W has a common fixed point in W whenever W is a nonempty weakly compact convex set in a uniformly convex in every direction Banach space U. Moreover, it is proved that a strong asymptotically nonexpansive action of a semitopological semigroup S on W has a common fixed point in W whenever W is a nonempty weakly compact convex set having the normal structure in a Banach space U and S is compact and reversible. Under the assumption of the asymptotic center property, it is proved that a strong asymptotically nonexpansive action of a commutative semitopological semigroup S on E has a common fixed point in E whenever E is a nonempty weak⁎ compact convex set in a dual Banach space .
{"title":"Strong asymptotically nonexpansive action and common fixed points on weak and weak⁎ compact convex sets","authors":"Abhishek","doi":"10.1016/j.topol.2025.109663","DOIUrl":"10.1016/j.topol.2025.109663","url":null,"abstract":"<div><div>In 1971, R. D. Holmes and A. T.-M. Lau generalized the class of nonexpansive action by introducing the notion of asymptotically nonexpansive action of a semitopological semigroup S on a nonempty subset <em>K</em> of a Banach space <em>U</em>. They proved that a right reversible asymptotically nonexpansive action of a semitopological semigroup S on <em>C</em> has a common fixed point in <em>C</em> whenever <em>C</em> is a nonempty compact convex set having the property (B) in a Banach space <em>U</em>. In 2018, Aminpour et al. introduced the notion of strong asymptotically nonexpansive action of a semitopological semigroup S on a nonempty subset <em>K</em> of a Banach space <em>U</em>. Aminpour et al. gave an analogous result to R. D. Holmes and A. T.-M. Lau without the property (B). Without the assumption of property (B), we prove that a left reversible strong asymptotically nonexpansive action of a semitopological semigroup S on <em>W</em> has a common fixed point in <em>W</em> whenever <em>W</em> is a nonempty weakly compact convex set in a uniformly convex in every direction Banach space <em>U</em>. Moreover, it is proved that a strong asymptotically nonexpansive action of a semitopological semigroup S on <em>W</em> has a common fixed point in <em>W</em> whenever <em>W</em> is a nonempty weakly compact convex set having the normal structure in a Banach space <em>U</em> and S is compact and reversible. Under the assumption of the asymptotic center property, it is proved that a strong asymptotically nonexpansive action of a commutative semitopological semigroup S on <em>E</em> has a common fixed point in <em>E</em> whenever <em>E</em> is a nonempty weak<sup>⁎</sup> compact convex set in a dual Banach space <span><math><mi>U</mi><msup><mrow></mrow><mrow><mo>⁎</mo></mrow></msup></math></span>.</div></div>","PeriodicalId":51201,"journal":{"name":"Topology and its Applications","volume":"377 ","pages":"Article 109663"},"PeriodicalIF":0.5,"publicationDate":"2025-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145571265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-11DOI: 10.1016/j.topol.2025.109658
Danica Kosanović
Motivated by recent results on diffeomorphisms of 4-manifolds, this paper investigates fundamental groups of spaces of embeddings of in 4-manifolds. The majority of work goes into the case of framed immersed circles.
{"title":"On fundamental groups of spaces of framed embeddings of a circle in a 4-manifold","authors":"Danica Kosanović","doi":"10.1016/j.topol.2025.109658","DOIUrl":"10.1016/j.topol.2025.109658","url":null,"abstract":"<div><div>Motivated by recent results on diffeomorphisms of 4-manifolds, this paper investigates fundamental groups of spaces of embeddings of <span><math><msup><mrow><mi>S</mi></mrow><mrow><mn>1</mn></mrow></msup><mo>×</mo><msup><mrow><mi>D</mi></mrow><mrow><mn>3</mn></mrow></msup></math></span> in 4-manifolds. The majority of work goes into the case of framed immersed circles.</div></div>","PeriodicalId":51201,"journal":{"name":"Topology and its Applications","volume":"377 ","pages":"Article 109658"},"PeriodicalIF":0.5,"publicationDate":"2025-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145520225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-10DOI: 10.1016/j.topol.2025.109660
Daniel Jardón , Iván Sánchez , Manuel Sanchis
Given a uniform space , we denote by the family of all normal upper semicontinuous fuzzy sets with compact support. In this paper, we study transitivity on some uniformities on : the level-wise uniformity , the Skorokhod uniformity , and the sendograph uniformity . If is a continuous function, we mainly characterize when the induced dynamical systems , and are transitive, where is the Zadeh's extension of f.
给定一个一致空间(X,U),用F(X)表示具有紧支持的所有正规上半连续模糊集U:X→[0,1]的族。本文研究了F(X)上一些均匀性的可传递性:水平均匀性U∞、Skorokhod均匀性U0和传感器均匀性US。如果f:(X,U)→(X,U)是连续函数,我们主要刻画了f:(f (X),U∞)→(f (X),U∞)、f:(f (X),U0)→(f (X),U0)和f:(f (X),US)→(f (X),US)是可传递的,其中f: f (X),US)→(f (X),US)是f的Zadeh扩展。
{"title":"Transitivity of some uniformities on fuzzy sets","authors":"Daniel Jardón , Iván Sánchez , Manuel Sanchis","doi":"10.1016/j.topol.2025.109660","DOIUrl":"10.1016/j.topol.2025.109660","url":null,"abstract":"<div><div>Given a uniform space <span><math><mo>(</mo><mi>X</mi><mo>,</mo><mi>U</mi><mo>)</mo></math></span>, we denote by <span><math><mi>F</mi><mo>(</mo><mi>X</mi><mo>)</mo></math></span> the family of all normal upper semicontinuous fuzzy sets <span><math><mi>u</mi><mo>:</mo><mi>X</mi><mo>→</mo><mo>[</mo><mn>0</mn><mo>,</mo><mn>1</mn><mo>]</mo></math></span> with compact support. In this paper, we study transitivity on some uniformities on <span><math><mi>F</mi><mo>(</mo><mi>X</mi><mo>)</mo></math></span>: the level-wise uniformity <span><math><msub><mrow><mi>U</mi></mrow><mrow><mo>∞</mo></mrow></msub></math></span>, the Skorokhod uniformity <span><math><msub><mrow><mi>U</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span>, and the sendograph uniformity <span><math><msub><mrow><mi>U</mi></mrow><mrow><mi>S</mi></mrow></msub></math></span>. If <span><math><mi>f</mi><mo>:</mo><mo>(</mo><mi>X</mi><mo>,</mo><mi>U</mi><mo>)</mo><mo>→</mo><mo>(</mo><mi>X</mi><mo>,</mo><mi>U</mi><mo>)</mo></math></span> is a continuous function, we mainly characterize when the induced dynamical systems <span><math><mover><mrow><mi>f</mi></mrow><mrow><mo>ˆ</mo></mrow></mover><mo>:</mo><mo>(</mo><mi>F</mi><mo>(</mo><mi>X</mi><mo>)</mo><mo>,</mo><msub><mrow><mi>U</mi></mrow><mrow><mo>∞</mo></mrow></msub><mo>)</mo><mo>→</mo><mo>(</mo><mi>F</mi><mo>(</mo><mi>X</mi><mo>)</mo><mo>,</mo><msub><mrow><mi>U</mi></mrow><mrow><mo>∞</mo></mrow></msub><mo>)</mo></math></span>, <span><math><mover><mrow><mi>f</mi></mrow><mrow><mo>ˆ</mo></mrow></mover><mo>:</mo><mo>(</mo><mi>F</mi><mo>(</mo><mi>X</mi><mo>)</mo><mo>,</mo><msub><mrow><mi>U</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>)</mo><mo>→</mo><mo>(</mo><mi>F</mi><mo>(</mo><mi>X</mi><mo>)</mo><mo>,</mo><msub><mrow><mi>U</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>)</mo></math></span> and <span><math><mover><mrow><mi>f</mi></mrow><mrow><mo>ˆ</mo></mrow></mover><mo>:</mo><mo>(</mo><mi>F</mi><mo>(</mo><mi>X</mi><mo>)</mo><mo>,</mo><msub><mrow><mi>U</mi></mrow><mrow><mi>S</mi></mrow></msub><mo>)</mo><mo>→</mo><mo>(</mo><mi>F</mi><mo>(</mo><mi>X</mi><mo>)</mo><mo>,</mo><msub><mrow><mi>U</mi></mrow><mrow><mi>S</mi></mrow></msub><mo>)</mo></math></span> are transitive, where <span><math><mover><mrow><mi>f</mi></mrow><mrow><mo>ˆ</mo></mrow></mover></math></span> is the Zadeh's extension of <em>f</em>.</div></div>","PeriodicalId":51201,"journal":{"name":"Topology and its Applications","volume":"377 ","pages":"Article 109660"},"PeriodicalIF":0.5,"publicationDate":"2025-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145520223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-10DOI: 10.1016/j.topol.2025.109659
Ahmad Reza Haj Saeedi Sadegh, Jody Trout
We extend the deformation to the normal cone and tangent groupoid constructions from finite-dimensional manifolds to infinite-dimensional Banach and Fredholm manifolds. Next, we generalize the concept of Fredholm filtrations to get a more flexible and functorial theory. In particular, we show that if M is a Banach (or Fredholm) manifold with generalized filtration by finite-dimensional submanifolds, then there are induced generalized filtrations of the tangent bundle TM and of the tangent groupoid , which is not possible in the classical theory.
{"title":"On deformation spaces, tangent groupoids and generalized filtrations of Banach and Fredholm manifolds","authors":"Ahmad Reza Haj Saeedi Sadegh, Jody Trout","doi":"10.1016/j.topol.2025.109659","DOIUrl":"10.1016/j.topol.2025.109659","url":null,"abstract":"<div><div>We extend the deformation to the normal cone and tangent groupoid constructions from finite-dimensional manifolds to infinite-dimensional Banach and Fredholm manifolds. Next, we generalize the concept of Fredholm filtrations to get a more flexible and functorial theory. In particular, we show that if <em>M</em> is a Banach (or Fredholm) manifold with generalized filtration <span><math><mi>F</mi><mo>=</mo><msubsup><mrow><mo>{</mo><msub><mrow><mi>M</mi></mrow><mrow><mi>n</mi></mrow></msub><mo>}</mo></mrow><mrow><mn>1</mn></mrow><mrow><mo>∞</mo></mrow></msubsup></math></span> by finite-dimensional submanifolds, then there are induced generalized filtrations <span><math><mi>T</mi><mi>F</mi><mo>=</mo><msubsup><mrow><mo>{</mo><mi>T</mi><msub><mrow><mi>M</mi></mrow><mrow><mi>n</mi></mrow></msub><mo>}</mo></mrow><mrow><mn>1</mn></mrow><mrow><mo>∞</mo></mrow></msubsup></math></span> of the tangent bundle <em>TM</em> and <span><math><mi>T</mi><mi>F</mi><mo>=</mo><msubsup><mrow><mo>{</mo><mi>T</mi><msub><mrow><mi>M</mi></mrow><mrow><mi>n</mi></mrow></msub><mo>}</mo></mrow><mrow><mn>1</mn></mrow><mrow><mo>∞</mo></mrow></msubsup></math></span> of the tangent groupoid <span><math><mi>T</mi><mi>M</mi></math></span>, which is not possible in the classical theory.</div></div>","PeriodicalId":51201,"journal":{"name":"Topology and its Applications","volume":"377 ","pages":"Article 109659"},"PeriodicalIF":0.5,"publicationDate":"2025-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145520224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}