Acta Mathematica Vietnamica最新文献

{"title":"Measure Pressure for Measure Preserving Maps and an Upper Bound for the Case of (C^2) Endomorphisms","authors":"Sanaz Lamei,&nbsp;Pouya Mehdipour,&nbsp;Maryam Razi","doi":"10.1007/s40306-025-00564-w","DOIUrl":"10.1007/s40306-025-00564-w","url":null,"abstract":"<div><p>A measure-theoretic pressure was defined by [L. He, J. Lv and L. Zhou: Definition of measure-theoretic pressure using spanning sets, <i>Acta Math. Sinica</i> (English Series) <b>20</b>, 709–718 (2004)] based on the Katok entropy formula. For a measure preserving map <i>f</i>, we generalized this definition to define a measure-theoretic pressure by using both <span>((n,epsilon ))</span>-spanning and <span>((n,epsilon ))</span>-separated sets. A variational principle for this pressure is established. Furthermore, we investigate an upper bound for the measure theoretic pressure of a <span>(C^{2})</span> endomorphism preserving a hyperbolic measure.</p></div>","PeriodicalId":45527,"journal":{"name":"Acta Mathematica Vietnamica","volume":"50 1","pages":"143 - 157"},"PeriodicalIF":0.3,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Differences of Products of Volterra Type Operators and Composition Operators Between Fock Spaces","authors":"Pham The Hao,&nbsp;Pham Trong Tien","doi":"10.1007/s40306-025-00563-x","DOIUrl":"10.1007/s40306-025-00563-x","url":null,"abstract":"<div><p>We characterize boundedness and compactness of the differences of products of Volterra integral operators <span>(V_g)</span> (Volterra companion operators <span>(J_g)</span>) and composition operators <span>(C_{varphi })</span> between different Fock spaces <span>(mathcal {F}^p(mathbb {C}))</span> and <span>(mathcal {F}^q(mathbb {C}))</span> for every <span>(p, q in (0, infty ])</span>.</p></div>","PeriodicalId":45527,"journal":{"name":"Acta Mathematica Vietnamica","volume":"50 1","pages":"123 - 141"},"PeriodicalIF":0.3,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dual-ADS, ADS(^#) and ADS* Modules","authors":"Abyzov Adel Nailevich,&nbsp;Bui Tien Dat,&nbsp;Truong Cong Quynh","doi":"10.1007/s40306-024-00562-4","DOIUrl":"10.1007/s40306-024-00562-4","url":null,"abstract":"<div><p>A right <i>R</i>-module <i>M</i> is said to be dual-ADS if for every decomposition <span>(M=Aoplus B)</span> then <i>A</i> and <i>B</i> are mutually projective. The class of ADS*-modules contains the class of dual-ADS modules. In this article, we study several properties of these modules. It is shown that a module <i>M</i> is dual-ADS if and only if for any direct summand <i>S</i> and <span>(T^prime le M)</span> with <span>(T^prime +S)</span> a direct summand of <i>M</i>, then <span>(T^prime )</span> contains a direct complement of <i>S</i> in <span>(T^prime +S)</span>. A generalization of dual-ADS modules is considered, namely, ADS<span>(^#)</span>-modules. It is shown that a module <i>M</i> is ADS<span>(^#)</span> if and only if for any direct summand <i>S</i> of <i>M</i>, and any weak supplement <span>(T^prime )</span> of <i>S</i> in <span>(T^prime +S)</span> such that <span>(T^prime +S)</span> is a direct summand of <i>M</i>, then <span>(T^prime )</span> contains a direct complement of <i>S</i> in <span>(T^prime +S)</span>.</p></div>","PeriodicalId":45527,"journal":{"name":"Acta Mathematica Vietnamica","volume":"50 1","pages":"101 - 121"},"PeriodicalIF":0.3,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Blow-up and Decay of Global Solutions for a Free Boundary Problem with Competing Nonlocal Nonlinearity and Absorption","authors":"Hoang Huy Truong,&nbsp;Dung Tien Nguyen,&nbsp;Hoang-Hung Vo","doi":"10.1007/s40306-024-00561-5","DOIUrl":"10.1007/s40306-024-00561-5","url":null,"abstract":"<div><p>In this paper, we are concerned with the characterization of the blow-up and global solutions for free boundary parabolic equation with competing nonlocal nonlinearity and absorption </p><div><div><span>$$begin{aligned} u_t(t,x) = u_{xx}(t,x) + u^{p}(t,x) int _0^{s(t)}u^{q}(t,x)dx -gamma u^alpha (t,x), t&gt;0, 0&lt;x &lt;s(t), end{aligned}$$</span></div><div>\u0000 (1)\u0000 </div></div><p>where <span>(q, alpha ge 1)</span>, <span>(p=0)</span> or <span>(pge 1)</span> and <span>(gamma &gt; 0)</span> are given constants. This study is motivated from the works [Abdelhedi and Zaag: J. Differential Equations <b>272</b>, 1–45, \u0000(2021); Souplet: SIAM J. Math. Anal. <b>29</b>, 1301–1334, \u0000(1998); Zhou and Lin: J. Funct. Anal. <b>262</b>, 3409–3429, \u0000(2012)] arisen from the investigation of many physical and biological phenomena such as population dynamics, combustion theory, phase separation in binary mixtures, theory of nuclear reactor dynamics... We first prove the local existence, uniqueness and stability of solution thanks to the “extension trick\" introduced in [Du et al.: Math. Ann. <b>386</b>(3-4), 2061–2106, \u0000(2023); Wang and Du: Discrete Contin. Dyn. Syst. Ser. B <b>26</b>(4), 2201–2238, \u0000(2021)]. Second, by improving the comparison principle used in [Souplet: SIAM J. Math. Anal. <b>29</b>, 1301–1334, \u0000(1998); Zhou and Lin: J. Funct. Anal. <b>262</b>, 3409–3429, \u0000(2012)], we find a sharp criterion characterizing the blow-up and global solutions of (1) in term of power coefficients and initial data. We further show that there exists a threshold for the initial data that determines whether blow-up, global fast, or global slow solutions occur and find an upper bound for the existence time of blow-up solutions in two different cases <span>(alpha &gt;1)</span> and <span>(alpha =1)</span>. Our proofs are mainly based on the comparison principle by improving several techniques in previous works, combined new idea to handle differential inequalities and unified local existence theory for nonlocal semilinear parabolic equations.</p></div>","PeriodicalId":45527,"journal":{"name":"Acta Mathematica Vietnamica","volume":"50 1","pages":"1 - 31"},"PeriodicalIF":0.3,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integral Closure of Powers of Edge Ideals of Weighted Oriented Graphs","authors":"Arindam Banerjee,&nbsp;Kanoy Kumar Das,&nbsp;Sirajul Haque","doi":"10.1007/s40306-024-00558-0","DOIUrl":"10.1007/s40306-024-00558-0","url":null,"abstract":"<div><p>In this article, we study monomial ideals associated with a simple graph, namely edge ideals of weighted oriented graphs. Let <i>D</i> be a weighted oriented graph. Assuming that all the vertices of <i>D</i> have weights greater than 1, we completely characterize weighted oriented graphs <i>D</i> for which <i>I</i>(<i>D</i>) is integrally closed, and show that this is equivalent to <i>I</i>(<i>D</i>) being normal. We also give an equivalent condition for <span>(overline{I(D)}=I(D))</span> when the underlying simple graph of <i>D</i> is a complete graph. Finally, we give a necessary and sufficient condition when the edge ideal of a uniform whiskered graph is integrally closed.</p></div>","PeriodicalId":45527,"journal":{"name":"Acta Mathematica Vietnamica","volume":"50 1","pages":"33 - 49"},"PeriodicalIF":0.3,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"General Form of Second Main Theorem on Generalized p-Parabolic Manifolds for Arbitrary Closed Subschemes","authors":"Duc Quang Si","doi":"10.1007/s40306-024-00553-5","DOIUrl":"10.1007/s40306-024-00553-5","url":null,"abstract":"<div><p>By introducing the notion of distributive constant for a family of closed subschemes, we establish a general form of the second main theorem for algebraic non-degenerate meromorphic mappings from a generalized <i>p</i>-Parabolic manifold into a projective variety with arbitrary families of closed subschemes. As its consequence, we give a second main theorem for such meromorphic mappings intersecting arbitrary hypersurfaces with an explicitly truncation level for the counting functions.</p></div>","PeriodicalId":45527,"journal":{"name":"Acta Mathematica Vietnamica","volume":"50 1","pages":"51 - 66"},"PeriodicalIF":0.3,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Generalized Semi-infinite Polynomial Optimization and Semidefinite Programming Relaxations","authors":"Liguo Jiao,&nbsp;Jae Hyoung Lee,&nbsp;Tiến-Sơn Phạm","doi":"10.1007/s40306-024-00551-7","DOIUrl":"10.1007/s40306-024-00551-7","url":null,"abstract":"<div><p>This paper focuses on the study of a generalized semi-infinite programming, where the objective and the constraint functions are all real polynomials. We present a method for finding its global minimizers and global minimum using a hierarchy of semidefinite programming relaxations and prove the convergence result for the method. Numerical experiments are presented to show the efficiency of the proposed algorithm.</p></div>","PeriodicalId":45527,"journal":{"name":"Acta Mathematica Vietnamica","volume":"49 3","pages":"441 - 457"},"PeriodicalIF":0.3,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Normalization of Singular Contact Forms and Primitive 1-forms","authors":"Kai Jiang,&nbsp;Hong Minh Truong,&nbsp;Nguyen Tien Zung","doi":"10.1007/s40306-024-00545-5","DOIUrl":"10.1007/s40306-024-00545-5","url":null,"abstract":"<div><p>A differential 1-form <span>(alpha )</span> on a manifold of odd dimension <span>(2n+1)</span>, which satisfies the contact condition <span>(alpha wedge (dalpha )^n ne 0)</span> almost everywhere, but which vanishes at a point <i>O</i>, i.e., <span>(alpha (O) = 0)</span>, is called a <i>singular contact form</i> at <i>O</i>. The aim of this paper is to study local normal forms (formal, analytic and smooth) of such singular contact forms. Our study leads naturally to the study of normal forms of singular primitive 1-forms of a symplectic form <span>(omega )</span> in dimension 2<i>n</i>, i.e., differential 1-forms <span>(gamma )</span> which vanish at a point and such that <span>(dgamma = omega )</span>, and their corresponding conformal vector fields. Our results are an extension and improvement of previous results obtained by other authors, in particular Lychagin (1975), Webster (Amer. J. Math. <b>109</b>, 807–832 (1987)) and Zhitomirskii (1986, 1992). Besides the classical normalization techniques, such as the step-by step normalization methods based on the cohomological equations and the Moser path method, we also use the toric approach to the normalization problem for dynamical systems (Jiang et al. 2019; Zung, Ann. Math. <b>161</b>, 141–156 2005; Zung 2016; Zung, Arch. Rational Mech. Anal. <b>229</b>, 789–833 (2018)).</p></div>","PeriodicalId":45527,"journal":{"name":"Acta Mathematica Vietnamica","volume":"49 3","pages":"327 - 345"},"PeriodicalIF":0.3,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40306-024-00545-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Degenerate Forward-backward Problem Involving the Spectral Dirichlet Laplacian","authors":"Nguyen Ngoc Trong,&nbsp;Bui Le Trong Thanh,&nbsp;Tan Duc Do","doi":"10.1007/s40306-024-00555-3","DOIUrl":"10.1007/s40306-024-00555-3","url":null,"abstract":"<div><p>Let <span>(varOmega )</span> be an open bounded subset of <span>({mathbb {R}})</span>, <span>(s in (frac{1}{2},1))</span> and <span>(epsilon &gt; 0)</span>. We investigate the problem </p><div><div><span>$$begin{aligned} (P_epsilon ) quad left{ begin{array}{ll} {partial }_t u = -(-Delta )^s big ( varphi (u) + epsilon , {partial }_t(psi (u)) big ) &amp; text { in } varOmega times (0,T], varphi (u) + epsilon , {partial }_t(psi (u)) = 0 &amp; text { on } {partial }varOmega times (0,T], u = u_0 &amp; text { in } varOmega times {0}, end{array}right. end{aligned}$$</span></div></div><p>where <span>(varphi , psi in C^infty ({mathbb {R}}))</span> and <span>(u_0 in {mathcal {M}}^+(varOmega ))</span> satisfy certain assumptions. Here <span>((-Delta )^s)</span> denotes the spectral Dirichlet Laplacian and <span>({mathcal {M}}^+(varOmega ))</span> is the set of positive Radon measures on <span>(varOmega )</span>. We show that <span>((P_epsilon ))</span> has a unique weak solution.</p></div>","PeriodicalId":45527,"journal":{"name":"Acta Mathematica Vietnamica","volume":"49 4","pages":"691 - 718"},"PeriodicalIF":0.3,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Asymptotically Almost Periodic and Almost Automorphic Solutions to the Non-autonomous Oseen-Navier-Stokes Equations","authors":"Ngoc Huy Nguyen,&nbsp;Thieu Huy Nguyen,&nbsp;Thi Ngoc Ha Vu","doi":"10.1007/s40306-024-00557-1","DOIUrl":"10.1007/s40306-024-00557-1","url":null,"abstract":"<div><p>In this paper, we investigate the existence, uniqueness and stability of asymptotically almost periodic and almost automorphic solutions to the non-autonomous Oseen-Navier-Stokes Equations (ONSE) in an unbounded domain <span>(varOmega subset mathbb {R}^{3})</span> exterior to a rigid body <i>D</i>, i.e., <span>(varOmega =mathbb {R}^{3}backslash D)</span>, with the data belonging to <i>L</i><span>(^{p})</span>-spaces and with the asymptotically almost periodic or almost automorphic external forces, respectively. Our method is based on the <i>L</i><span>(^{p}-L^{q})</span> smoothness of the evolution family corresponding to linearized equations in combination with interpolation functors and fixed-point arguments.</p></div>","PeriodicalId":45527,"journal":{"name":"Acta Mathematica Vietnamica","volume":"50 1","pages":"79 - 99"},"PeriodicalIF":0.3,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}