Xiaojun Chen, Youming Chen, Song Yang, Xiangdong Yang
{"title":"Holomorphic Koszul–Brylinski Homologies of Poisson Blow-ups","authors":"Xiaojun Chen, Youming Chen, Song Yang, Xiangdong Yang","doi":"10.1007/s10114-025-2365-9","DOIUrl":"10.1007/s10114-025-2365-9","url":null,"abstract":"<div><p>We derive a blow-up formula for holomorphic Koszul–Brylinski homologies of compact holomorphic Poisson manifolds. As applications, we investigate the invariance of the <i>E</i><sub>1</sub>-degeneracy of the Dolbeault–Koszul–Brylinski spectral sequence under Poisson blow-ups, and compute the holomorphic Koszul–Brylinski homology for del Pezzo surfaces and two complex nilmanifolds with holomorphic Poisson structures.</p></div>","PeriodicalId":50893,"journal":{"name":"Acta Mathematica Sinica-English Series","volume":"41 5","pages":"1462 - 1490"},"PeriodicalIF":0.9,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145166232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A Class of p-Laplacian Equations on Lattice Graphs","authors":"Lidan Wang","doi":"10.1007/s10114-025-3304-5","DOIUrl":"10.1007/s10114-025-3304-5","url":null,"abstract":"<div><p>In this paper, we study the <i>p</i>-Laplacian equation of the form </p><div><div><span>$$-Delta_{p}u+h(x)vert u vert^{p-2}u=(R_{alpha}* vert u vert^{q})vert u vert^{q-2}u+vert u vert ^{2q-2}u$$</span></div></div><p> on lattice graphs ℤ<sup><i>N</i></sup>, where <i>N</i> ∈ ℕ*, <i>α</i> ∈ (0, <i>N</i>), <span>(2 leq p < {2Nq over N+alpha}<+infty)</span> and <i>R</i><sub><i>α</i></sub> represents the Green’s function of the discrete fractional Laplacian, which has no singularity at the origin but behaves as the Riesz potential at infinity. Under suitable assumptions on the potential <i>h</i>(<i>x</i>), we prove the existence of ground state solutions to the equation above by two different methods.</p></div>","PeriodicalId":50893,"journal":{"name":"Acta Mathematica Sinica-English Series","volume":"41 5","pages":"1418 - 1430"},"PeriodicalIF":0.9,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Differences of Composition Operators from Classical Zygmund Space to Bloch-type Space","authors":"Jinhao Liu, Yuxia Liang, Zicong Yang","doi":"10.1007/s10114-025-3224-4","DOIUrl":"10.1007/s10114-025-3224-4","url":null,"abstract":"<div><p>The aim of this paper is to explore the equivalent characterizations for the boundedness and compactness of <i>C</i><sub><i>φ</i></sub> − <i>C</i><sub><i>ψ</i></sub> acting from classical (little) Zygmund space <span>({cal{Z}}({cal{Z}}_{0}))</span> to (little) Bloch-type space <span>({cal{B}}^{alpha};({cal{B}}_{0}^{alpha}))</span>. Especially, we creatively develop a useful lemma, which not only plays a crucial role in the estimations but also offers a sufficient condition for the bounded below property of composition operators.</p></div>","PeriodicalId":50893,"journal":{"name":"Acta Mathematica Sinica-English Series","volume":"41 5","pages":"1431 - 1446"},"PeriodicalIF":0.9,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Twisted and Absolute Degrees of Maps into the Projective Plane","authors":"Marcio Colombo Fenille, Daciberg Lima Gonçalves","doi":"10.1007/s10114-025-3336-x","DOIUrl":"10.1007/s10114-025-3336-x","url":null,"abstract":"<div><p>For each based map <i>f</i>: <i>X</i> → ℝP<sup>2</sup> from a closed surface into the real projective plane, we compute its absolute and twisted degrees and describe the action of the fundamental group of ℝP<sup>2</sup> over the based homotopy class of <i>f</i>. We emphasize the finding that for any nonorientable closed surface, there exists only one based homotopy class of maps from it into ℝP<sup>2</sup> whose maps have twisted degree zero and absolute degree nonzero–which shows that, unlike the absolute degree, the twisted degree is not able to detect the strong surjectivity in this setting. In all the other scenarios, the absolute degree of each map is either equal to the twisted degree or its absolute value–and so the twisted degree detects strong surjectivity.</p></div>","PeriodicalId":50893,"journal":{"name":"Acta Mathematica Sinica-English Series","volume":"41 5","pages":"1393 - 1406"},"PeriodicalIF":0.9,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Carlos Gustavo Moreira, Christian Camilo Silva Villamil
{"title":"Concentration of Dimension in Extremal Points of Left-half Lines in the Lagrange Spectrum","authors":"Carlos Gustavo Moreira, Christian Camilo Silva Villamil","doi":"10.1007/s10114-025-3683-7","DOIUrl":"10.1007/s10114-025-3683-7","url":null,"abstract":"<div><p>We prove that for any <i>η</i> that belongs to the closure of the interior of the Markov and Lagrange spectra, the sets <i>k</i><sup>−1</sup>((−∞, <i>η</i>]) and <i>k</i><sup>−1</sup>(<i>η</i>), which are the sets of irrational numbers with best constant of Diophantine approximation bounded by <i>η</i> and exactly <i>η</i> respectively, have the same Hausdorff dimension. We also show that, as <i>η</i> varies in the interior of the spectra, this Hausdorff dimension is a strictly increasing function.</p></div>","PeriodicalId":50893,"journal":{"name":"Acta Mathematica Sinica-English Series","volume":"41 5","pages":"1328 - 1352"},"PeriodicalIF":0.9,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"On the Existence of Solutions for Prescribing Fractional Q-curvature Problem on ({mathbb S}^{n})","authors":"Yan Li, Zhongwei Tang","doi":"10.1007/s10114-025-3630-7","DOIUrl":"10.1007/s10114-025-3630-7","url":null,"abstract":"<div><p>The aim of this paper is to investigate the existence of solutions to the prescribing fractional <i>Q</i>-curvature problem on <span>({mathbb S}^{n})</span> under some reasonable assumption of the Laplacian sign at the critical point of prescribing curvature function <i>K</i>. Due to the lack of compactness, we choose to return to the basic elements of variational theory and study the deformation along the flow lines. The novelty of the paper is that we obtain the existence without assuming any symmetry and periodicity on <i>K</i>. In addition, to overcome the loss of compactness for high-order operator problem, we need more delicate estimates with the second order cases.</p></div>","PeriodicalId":50893,"journal":{"name":"Acta Mathematica Sinica-English Series","volume":"41 5","pages":"1296 - 1314"},"PeriodicalIF":0.9,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Morse Index and Maslov-type Index of the Discrete Hamiltonian System","authors":"Gaosheng Zhu","doi":"10.1007/s10114-025-2580-4","DOIUrl":"10.1007/s10114-025-2580-4","url":null,"abstract":"<div><p>In this paper, we give the definition of Maslov-type index of the discrete Hamiltonian system, and obtain the relation of Morse index and Maslov-type index of the discrete Hamiltonian system which is a generalization of the case <i>ω</i> = 1 to <i>ω</i> ∈ <b>U</b> degenerate case via direct method which is different from that of the known literatures. Moreover the well-posedness of the splitting numbers <span>(cal{S}_{h,omega}^{pm})</span> is proven, then the index iteration theories of Bott and Long are also valid for the discrete case, and those can be also applied to the study of the symplectic algorithm.</p></div>","PeriodicalId":50893,"journal":{"name":"Acta Mathematica Sinica-English Series","volume":"41 5","pages":"1353 - 1392"},"PeriodicalIF":0.9,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10114-025-2580-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Ground State Solutions to Some Indefinite Nonlinear Schrödinger Equations on Lattice Graphs","authors":"Wendi Xu","doi":"10.1007/s10114-025-3111-z","DOIUrl":"10.1007/s10114-025-3111-z","url":null,"abstract":"<div><p>In this paper, we consider the Schrödinger type equation −Δ<i>u</i> + <i>V</i> (<i>x</i>)<i>u</i> = <i>f</i>(<i>x, u</i>) on the lattice graph ℤ<sup><i>N</i></sup> with indefinite variational functional, where Δ is the discrete Laplacian. Specifically, we assume that <i>V</i> (<i>x</i>) and <i>f</i>(<i>x, u</i>) are periodic in <i>x, f</i> satisfies some growth condition and 0 lies in a finite spectral gap of (−Δ + <i>V</i>). We obtain ground state solutions by using the method of generalized Nehari manifold which has been introduced by Pankov.</p></div>","PeriodicalId":50893,"journal":{"name":"Acta Mathematica Sinica-English Series","volume":"41 5","pages":"1279 - 1295"},"PeriodicalIF":0.9,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Limit Cycles of Liénard Systems with Several Equilibria","authors":"Hebai Chen, Yilei Tang, Dongmei Xiao","doi":"10.1007/s10114-025-3420-2","DOIUrl":"10.1007/s10114-025-3420-2","url":null,"abstract":"<div><p>In the paper we generalize some classic results on limit cycles of Liénard system</p><div><div><span>$$dot{x}=phi(y)-F(x),quaddot{y}=-g(x)$$</span></div></div><p>having a unique equilibrium to that of the system with several equilibria. As applications, we strictly prove the number of limit cycles and obtain the distribution of limit cycles for three classes of Liénard systems, in which we correct a mistake in the literature.</p></div>","PeriodicalId":50893,"journal":{"name":"Acta Mathematica Sinica-English Series","volume":"41 4","pages":"1104 - 1130"},"PeriodicalIF":0.8,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Geometric Probability on a Lattice with the 15th Type of Convex Pentagon as a Fundamental Region","authors":"Jiangfu Zhao, Jun Jiang, Hai Liu","doi":"10.1007/s10114-025-3268-5","DOIUrl":"10.1007/s10114-025-3268-5","url":null,"abstract":"<div><p>In 2015, a group of mathematicians at the University of Washington, Bothell, discovered the 15th pentagon that can cover a plane, with no gaps and overlaps. However, research on its containment measure theory or geometric probability is limited. In this study, the Laplace extension of Buffon’s problem is generalized to the case of the 15th pentagon. In the solving process, the explicit expressions for the generalized support function and containment function of this irregular pentagon are derived. In addition, the chord length distribution function and density function of random distance of this pentagon are obtained in terms of the containment function.</p></div>","PeriodicalId":50893,"journal":{"name":"Acta Mathematica Sinica-English Series","volume":"41 4","pages":"1213 - 1230"},"PeriodicalIF":0.8,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}