Acta Mathematica Scientia最新文献

{"title":"An optimal control problem for a Lotka-Volterra competition model with chemo-repulsion","authors":"Diana I. Hernández, Diego A. Rueda-Gómez, Élder J. Villamizar-Roa","doi":"10.1007/s10473-024-0219-7","DOIUrl":"https://doi.org/10.1007/s10473-024-0219-7","url":null,"abstract":"<p>In this paper we study a bilinear optimal control problem for a diffusive Lotka-Volterra competition model with chemo-repulsion in a bounded domain of ℝ^ℕ, <i>N</i> = 2, 3. This model describes the competition of two species in which one of them avoid encounters with rivals through a chemo-repulsion mechanism. We prove the existence and uniqueness of weak-strong solutions, and then we analyze the existence of a global optimal solution for a related bilinear optimal control problem, where the control is acting on the chemical signal. Posteriorly, we derive first-order optimality conditions for local optimal solutions using the Lagrange multipliers theory. Finally, we propose a discrete approximation scheme of the optimality system based on the gradient method, which is validated with some computational experiments.</p>","PeriodicalId":50998,"journal":{"name":"Acta Mathematica Scientia","volume":"35 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139765632","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}

{"title":"Strongly convergent inertial forward-backward-forward algorithm without on-line rule for variational inequalities","authors":"Yonghong Yao, Abubakar Adamu, Yekini Shehu","doi":"10.1007/s10473-024-0210-3","DOIUrl":"https://doi.org/10.1007/s10473-024-0210-3","url":null,"abstract":"<p>This paper studies a strongly convergent inertial forward-backward-forward algorithm for the variational inequality problem in Hilbert spaces. In our convergence analysis, we do not assume the on-line rule of the inertial parameters and the iterates, which have been assumed by several authors whenever a strongly convergent algorithm with an inertial extrapolation step is proposed for a variational inequality problem. Consequently, our proof arguments are different from what is obtainable in the relevant literature. Finally, we give numerical tests to confirm the theoretical analysis and show that our proposed algorithm is superior to related ones in the literature.</p>","PeriodicalId":50998,"journal":{"name":"Acta Mathematica Scientia","volume":"26 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139765621","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}

{"title":"The weighted Kato square root problem of elliptic operators having a BMO anti-symmetric part","authors":"Wenxian Ma, Sibei Yang","doi":"10.1007/s10473-024-0209-9","DOIUrl":"https://doi.org/10.1007/s10473-024-0209-9","url":null,"abstract":"<p>Let <i>n</i> ≥ 2 and let <i>L</i> be a second-order elliptic operator of divergence form with coefficients consisting of both an elliptic symmetric part and a BMO anti-symmetric part in ℝ^<i>n</i>. In this article, we consider the weighted Kato square root problem for <i>L</i>. More precisely, we prove that the square root <i>L</i>^1/2 satisfies the weighted <i>L</i>^<i>p</i> estimates <span>(||{L^{1/2}}(f)|{|_{L_omega ^p({mathbb{R}^n})}} le C||nabla f|{|_{L_omega ^p({mathbb{R}^n};{mathbb{R}^n})}})</span> for any <i>p</i> ∈ (1, ∞) and ω ∈ <i>A</i>_<i>p</i>(ℝ^<i>n</i>) (the class of Muckenhoupt weights), and that <span>(||nabla f|{|_{L_omega ^p({mathbb{R}^n};{mathbb{R}^n})}} le C||{L^{1/2}}(f)|{|_{L_omega ^p({mathbb{R}^n})}})</span> for any p ∈ (1, 2 + <i>ε</i>) and <i>ω</i> ∈ <i>A</i>_<i>p</i>(ℝ^<i>n</i>) ∩ <span>(R{H_{({{2 + varepsilon } over p})prime }}({mathbb{R}^n}))</span> (the class of reverse Hölder weights), where ε ∈ (0, ∞) is a constant depending only on <i>n</i> and the operator <i>L</i>, and where <span>(({{2 + varepsilon } over p})prime )</span> denotes the Hölder conjugate exponent of <span>({{2 + varepsilon } over p})</span>. Moreover, for any given <i>q</i> ∈ (2, ∞), we give a sufficient condition to obtain that <span>(||nabla f|{|_{L_omega ^p({mathbb{R}^n};{mathbb{R}^n})}} le C||{L^{1/2}}(f)|{|_{L_omega ^p({mathbb{R}^n})}})</span> for any <i>p</i> ∈ (1, <i>q</i>) and <span>(omega in {A_p}({mathbb{R}^n}) cap R{H_{({q over p})prime }}({mathbb{R}^n}))</span>. As an application, we prove that when the coefficient matrix A that appears in <i>L</i> satisfies the small BMO condition, the Riesz transform ∇<i>L</i>^−1/2 is bounded on <i>L</i><span>\u0000^<i>p</i>_<i>ω</i>\u0000</span><i>(</i>ℝ^<i>n</i>) for any given <i>p</i> ∈ (1, ∞) and ω ∈ <i>A</i>_<i>p</i>(ℝ^<i>n</i>). Furthermore, applications to the weighted <i>L</i>²-regularity problem with the Dirichlet or the Neumann boundary condition are also given.</p>","PeriodicalId":50998,"journal":{"name":"Acta Mathematica Scientia","volume":"80 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139765639","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}

{"title":"The smoothing effect in sharp Gevrey space for the spatially homogeneous non-cutoff Boltzmann equations with a hard potential","authors":"Lvqiao Liu, Juan Zeng","doi":"10.1007/s10473-024-0205-0","DOIUrl":"https://doi.org/10.1007/s10473-024-0205-0","url":null,"abstract":"","PeriodicalId":50998,"journal":{"name":"Acta Mathematica Scientia","volume":"11 17","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138585292","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}

{"title":"On the Sobolev Dolbeault cohomology of a domain with pseudoconcave boundaries","authors":"Jian Chen","doi":"10.1007/s10473-024-0203-2","DOIUrl":"https://doi.org/10.1007/s10473-024-0203-2","url":null,"abstract":"","PeriodicalId":50998,"journal":{"name":"Acta Mathematica Scientia","volume":"11 11","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138585297","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}

{"title":"From wave functions to tau-functions for the Volterra lattice hierarchy","authors":"Ang Fu, Mingjin Li, Di Yang","doi":"10.1007/s10473-024-0201-4","DOIUrl":"https://doi.org/10.1007/s10473-024-0201-4","url":null,"abstract":"","PeriodicalId":50998,"journal":{"name":"Acta Mathematica Scientia","volume":"3 7","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138585695","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}

{"title":"Estimate on the Bloch constant for certain harmonic mappings under a differential operator","authors":"Jieling Chen,&nbsp;Mingsheng Liu","doi":"10.1007/s10473-024-0116-0","DOIUrl":"10.1007/s10473-024-0116-0","url":null,"abstract":"<div><p>In this paper, we first obtain the precise values of the univalent radius and the Bloch constant for harmonic mappings of the form <span>(L(f) = z{f_z} - bar z{f_{bar z}})</span>, where <i>f</i> represents normalized harmonic mappings with bounded dilation. Then, using these results, we present better estimations for the Bloch constants of certain harmonic mappings <i>L</i>(<i>f</i>), where <i>f</i> is a <i>K</i>-quasiregular harmonic or open harmonic. Finally, we establish three versions of Bloch-Landau type theorem for biharmonic mappings of the form <i>L</i>(<i>f</i>). These results are sharp in some given cases and improve the related results of earlier authors.</p></div>","PeriodicalId":50998,"journal":{"name":"Acta Mathematica Scientia","volume":"44 1","pages":"295 - 310"},"PeriodicalIF":0.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138473088","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}

{"title":"Entire solutions of higher order differential equations with entire coefficients having the same order","authors":"Ziheng Feng,&nbsp;Zhibo Huang,&nbsp;Yezhou Li","doi":"10.1007/s10473-024-0119-x","DOIUrl":"10.1007/s10473-024-0119-x","url":null,"abstract":"<div><p>In this paper, we consider entire solutions of higher order homogeneous differential equations with the entire coefficients having the same order, and prove that the entire solutions are of infinite lower order. The properties on the radial distribution, the limit direction of the Julia set and the existence of a Baker wandering domain of the entire solutions are also discussed.</p></div>","PeriodicalId":50998,"journal":{"name":"Acta Mathematica Scientia","volume":"44 1","pages":"355 - 368"},"PeriodicalIF":0.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138473256","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}

{"title":"On De Finetti’s optimal impulse dividend control problem under Chapter 11 bankruptcy","authors":"Wenyuan Wang,&nbsp;Ruixing Ming,&nbsp;Yijun Hu","doi":"10.1007/s10473-024-0112-4","DOIUrl":"10.1007/s10473-024-0112-4","url":null,"abstract":"<div><p>Motivated by recent advances made in the study of dividend control and risk management problems involving the U.S. bankruptcy code, in this paper we follow [44] to revisit the De Finetti dividend control problem under the reorganization process and the regulator’s intervention documented in U.S. Chapter 11 bankruptcy. We do this by further accommodating the fixed transaction costs on dividends to imitate the real-world procedure of dividend payments. Incorporating the fixed transaction costs transforms the targeting optimal dividend problem into an impulse control problem rather than a singular control problem, and hence computations and proofs that are distinct from [44] are needed. To account for the financial stress that is due to the more subtle concept of Chapter 11 bankruptcy, the surplus process after dividends is driven by a piece-wise spectrally negative Lévy process with endogenous regime switching. Some explicit expressions of the expected net present values under a double barrier dividend strategy, new to the literature, are established in terms of scale functions. With the help of these expressions, we are able to characterize the optimal strategy among the set of admissible double barrier dividend strategies. When the tail of the Lévy measure is log-convex, this optimal double barrier dividend strategy is then verified as the optimal dividend strategy, solving our optimal impulse control problem.</p></div>","PeriodicalId":50998,"journal":{"name":"Acta Mathematica Scientia","volume":"44 1","pages":"215 - 233"},"PeriodicalIF":0.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138473138","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}

{"title":"Cauchy type integrals and a boundary value problem in a complex Clifford analysis","authors":"Nanbin Cao,&nbsp;Zunfeng Li,&nbsp;Heju Yang,&nbsp;Yuying Qiao","doi":"10.1007/s10473-024-0120-4","DOIUrl":"10.1007/s10473-024-0120-4","url":null,"abstract":"<div><p>Clifford analysis is an important branch of modern analysis; it has a very important theoretical significance and application value, and its conclusions can be applied to the Maxwell equation, Yang-Mill field theory, quantum mechanics and value problems. In this paper, we first give the definition of a quasi-Cauchy type integral in complex Clifford analysis, and get the Plemelj formula for it. Second, we discuss the Hölder continuity for the Cauchy-type integral operators with values in a complex Clifford algebra. Finally, we prove the existence of solutions for a class of linear boundary value problems and give the integral representation for the solution.</p></div>","PeriodicalId":50998,"journal":{"name":"Acta Mathematica Scientia","volume":"44 1","pages":"369 - 385"},"PeriodicalIF":0.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138473255","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}