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    Robust Accessible Hyperbolic Repelling Sets
    Xiao Jianrong
    Acta mathematica scientia,Series A    2024, 44 (1): 1-11.  
    Abstract195)   HTML11)    PDF(pc) (800KB)(305)       Save

    By operating Denjoy like surgery on a piecewise linear map, we constructed a family of$C^1$maps$f_\alpha \ (1<\alpha<3 )$admitting the following properties:

    1)$f_\alpha$admits a hyperbolic repelling Cantor set$\mathcal{A}_\alpha$with positive Lebesgue measure, and$\mathcal{A}_\alpha$is also a wild attractor of$f_{\alpha}$;

    2) The attractor$\mathcal{A}_\alpha$is accessible: the difference set$\mathbb{B}(A_\alpha)\backslash A_\alpha$between the basin of attraction$\mathbb{B}(A_\alpha)$and$A_\alpha$has positive Lebesgue measure;

    3) The family is structurally stable:$f_{\alpha}$is topologically conjugate to$f_{\alpha'}$for all$1<\alpha,\ \alpha'<3$.

    The surgery involves blowing up the discontinuity and its preimages set into open intervals. The$C^1$smoothness of$f_{\alpha}$is ensured by the prescribed lengths of glued intervals and the maps defined on the glued intervals.

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    An Extension of Minkowski Formulae for Free Boundary Hypersurfaces in a Ball
    Sheng Weimin, Wang Yinhang
    Acta mathematica scientia,Series A    2023, 43 (6): 1641-1648.  
    Abstract194)   HTML19)    PDF(pc) (508KB)(376)       Save

    In this article, we prove a generalization of Hsiung-Minkowski formula for free boundary hypersurfaces in a ball in space forms. As corollaries, we obtain some Alexandrov-type results.

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    Uncertainty Principles of Fractional Fourier Transform
    Zhou Yue, Yang Yan
    Acta mathematica scientia,Series A    2024, 44 (2): 257-264.  
    Abstract167)   HTML13)    PDF(pc) (564KB)(161)       Save

    Referring to the properties of Fourier transform, the authors find the uncertainty principle of discrete fractional Fourier transform and uncertainty principle of continuous fractional Fourier transform under Lebesgue measure, which makes the uncertainty principles of fractional Fourier transform more general.

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    Eigenvalues of a Class of Second-Order Differential Operator with Eigenparameters Dependent Internal Point Conditions
    Liu Wei, Xu Meizhen
    Acta mathematica scientia,Series A    2024, 44 (4): 815-828.  
    Abstract142)   HTML6)    PDF(pc) (535KB)(143)       Save

    This paper mainly discusses the self-adjointness and eigenvalue dependence of a class of second-order differential operator with internal point conditions containing an eigenparameter. First, a problem-related linear operator $T$ is defined in an appropriate Hilbert space, and the study of the problem to be transformed into the research of the operator $T$ in this space, and the operator $T$ is proved to be self-adjoint according to the definition of self-adjoint operator. In addition, on the basis of self-adjoint, it is proved that the eigenvalues are not only continuously dependent but also differentiable on each parameter of the problem, and the corresponding differential expressions are given. Meanwhile, the monotonicity of the eigenvalues with respect to the part parameters of the problem is also discussed.

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    Hankel Operators on Vector-Valued Bergman Space with Exponential Type Weights
    Dong Jianxiang
    Acta mathematica scientia,Series A    2024, 44 (3): 513-524.  
    Abstract133)   HTML15)    PDF(pc) (747KB)(154)       Save

    In this paper, we study some characterizations of Hankel operators on vector-valued exponential type weights Bergman spaces $A^{2}_{\varphi}(\mathcal{H})$ induced by operator-valued function symbols and co-analytic operator-valued function symbols. Main results including the boundedness and compactness of Hankel operators.

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    The Fine Pseudo-spectra of$2 \times 2$Diagonal Block Operator Matrices
    Shen Runshuan, Hou Guolin
    Acta mathematica scientia,Series A    2024, 44 (1): 12-25.  
    Abstract110)   HTML3)    PDF(pc) (557KB)(191)       Save

    Let$A$,$B$be densely closed linear operators in a separable Hilbert space$X$and$M_{0}=\left( \begin{array} {cc}{A} & {0}\\ {0}& {B} \end{array} \right)$be the corresponding$2\times2$block operator matrices. In this paper, we establish the fine pseudo-spectra of$M_{0}$including the pseudo-point spectrum, the pseudo-residual spectrum, and the pseudo-continuous spectrum under diagonal perturbation, which are, respectively, compared with its point spectrum, residual spectrum, and continuous spectrum. And a concrete example is constructed to justify the proved result. Finally, we obtain the pseudo-point spectrum of$M_{0}$under the upper-triangular perturbation by using the technology of space decomposition.

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    The Discrete Series of Affine Symmetric Space ${SO^\ast(6)/SO(3,\mathbb{C})}$
    Lan Chao, Fan Xingya
    Acta mathematica scientia,Series A    2023, 43 (6): 1649-1658.  
    Abstract94)   HTML10)    PDF(pc) (594KB)(120)       Save

    In this paper, the partial discrete sequence of $SO^\ast(6)/SO(3,\mathbb{C})$ is obtained by local isomorphism of Hermite-type affine symmetric space, and the specific form of the holomorphic discrete sequence generated by the cyclic vector is given.

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    A Vanishing Theorem for$p$-harmonic$\ell$-forms in Space with Constant Curvature
    Zhang Youhua
    Acta mathematica scientia,Series A    2024, 44 (1): 26-36.  
    Abstract89)   HTML1)    PDF(pc) (551KB)(162)       Save

    Let$M^{n}(n \geq 3)$be a complete non-compact submanifold immersed in a space with constant curvature$N^{n+m}(c)$with flat normal bundle. By using Bochner-Weitzenböck formula, Sobolev inequality, Moser iteration and Fatou lemma, we prove that every$L^{\beta}~p$-harmonic forms on$M$is trivial if$M^{n}$satisfies some geometic conditions, where$\beta\geq p\geq 2$.

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    $q$-Ramanujan Asymptotic Formula and $q$-Ramanujan $R$-function
    Bao Qi, Wang Miaokun, Chu Yuming
    Acta mathematica scientia,Series A    2023, 43 (6): 1659-1666.  
    Abstract85)   HTML3)    PDF(pc) (530KB)(222)       Save

    In this paper, the Ramanujan asymptotic formula of the Gaussian hypergeometric function $_{2}F_{1}$ and its related Ramanujan $R$-function will be generalized to the case of basic hypergeometric series $_{2}\phi_{1}$. On the one hand, we shall present the $q$-Ramanujan asymptotic formula of $_{2}\phi_{1}$ and introduce the $q$-Ramanujan $R$-function; on the other hand, we shall mainly study the $q$-Ramanujan $R$-function, and prove some analytical properties of the $q$-Ramanujan $R$-function including series expansions, complete monotonicity property and monotonicity property with respect to the parameter $q$. As applications, several sharp inequalities for the $q$-Ramanujan $R$-function will be derived.

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    Hankel Operators on vector-valued Bergman space with exponential type weights
    Jian-Xiang DONG
    Acta mathematica scientia,Series A   
    Accepted: 18 January 2024

    An Effective Fourier Spectral Approximation for Fourth-Order Eigenvalue Problems with Periodic Boundary Conditions
    He Ya, An Jing
    Acta mathematica scientia,Series A    2024, 44 (1): 37-49.  
    Abstract79)   HTML0)    PDF(pc) (624KB)(181)       Save

    In this paper, we put forward an effective Fourier spectral approximation method for fourth-order eigenvalue problems with periodic boundary conditions. Firstly, we introduce the appropriate Sobolev space and the corresponding approximation space according to the periodic boundary conditions, establish a weak form of the original problem and its discrete form, and derive the equivalent operator form. Then we define an orthogonal projection operator and prove its approximation properties. Combined with the spectral theory of compact operators, we prove the error estimates of approximation eigenvalues. In addition, we construct a set of basis functions of the approximation space, and derive the matrix form based on tensor product associated with the discrete scheme. Finally, we provide some numerical examples, and the numerical results show our algorithm is effective and spectral accuracy.

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    On Symmetry of the Product of Two Higher-Order Regular Quasi-Differential Operators
    Xiang Yanyu, Wang Aiping
    Acta mathematica scientia,Series A    2024, 44 (2): 265-275.  
    Abstract79)   HTML3)    PDF(pc) (553KB)(59)       Save

    The symmetric realizations of the product of two general regular quasi-differential expressions in Hilbert space are investigated. The two-point boundary conditions which determine symmetric operators are characterized and a sufficient and necessary condition for the product of two higher-order regular differential operators to be symmetric is obtained. The presented result contains the self-adjoint do-main characterization as a special case. Several examples of regular symmetric product operators are given.

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    Uniqueness and Asymptotic Stability of Time-Periodic Solutions for the Fractional Burgers Equation
    Xu Fei, Zhang Yong
    Acta mathematica scientia,Series A    2023, 43 (6): 1710-1722.  
    Abstract77)   HTML3)    PDF(pc) (600KB)(235)       Save

    The paper is concerned with the time-periodic (T-periodic) problem of fractional Burgers equation on the real line. Based on the Galerkin approximates and Fourier expansion, we first prove the existence of T-periodic solution to a linearized version. Then, the existence and uniqueness of T-periodic solution for the nonlinear equation are established by constructing a suitable contraction mapping. Furthermore, we show that the unique T-periodic solution is asymptotically stable. In addition, our method can be extended to the classical forced Burgers equation in a bounded region, which improves the known result.

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    Two-Weight Inequalities for $ {n}$-dimentional Hardy Operator and Commutators
    Wang Yaoyao, Lv Meichuan, Li Wenming
    Acta mathematica scientia,Series A    2024, 44 (3): 539-546.  
    Abstract76)   HTML6)    PDF(pc) (617KB)(72)       Save

    Let $ P $ be the Hardy operator on $ \mathbb{R}^n $ and $ Q $ be the adjoint operator. In this paper, we get the two-weight inequalities for $ P $, $ Q $ and the commutators of $ P $ and $ Q $ with $ CMO $ functions.

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    Entanglement Measure of Two-body Quantum System Based on the Wedge Product of Vectors
    Yang Zhaodi, He Kan, Duan Zhoubo
    Acta mathematica scientia,Series A    2024, 44 (1): 246-256.  
    Abstract74)   HTML4)    PDF(pc) (570KB)(156)       Save

    The characterization of quantum entanglement is an unsolved problem. It is interested to measure entanglement based on the geometric properties of vectors because a quantum state is represented as a unit vector in a Hilbert space. Some scholars have defined an entanglement measure on the two-body pure state system$C^{2}\otimes C^{2}$based on the modulus length of the wedge product of two vectors, whose modulus length corresponds geometrically to the area of an oriented parallelogram on a plane. In the work, we give the entanglement measures on the two-body pure state system$C^{3}\otimes C^{3}$and$C^{d}\otimes C^{d}$by using the modular length of the wedge product of vectors. They geometrically correspond to the volume of an oriented parallelepiped and$d\times(d-1)\times\cdots\times4$oriented parallelepipeds. In addition, We propose a geometric criterion for determining separable states. The results show that the entanglement measure$E$defined based on the geometric background of mathematics is a simple and intuitive measurement method.

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    Normalized Solution of Fractional Schrödinger-Poisson Equations with Coercive Potential
    Li Renhua, Wang Zhengping
    Acta mathematica scientia,Series A    2023, 43 (6): 1723-1730.  
    Abstract74)   HTML4)    PDF(pc) (521KB)(231)       Save

    In this paper, we study the existence of normalized solutions for a class of fractional Schrödinger-Poisson equations with coercive potential by using the constrained variational method, which generalizes the results of the relevant literature.

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    EC-tractability of Multivariate $\mathbb{L}_{\infty}$-approximation in Weighted Korobov Spaces
    Zhang Jie, Sun Yiming, Liu Yongping
    Acta mathematica scientia,Series A    2024, 44 (3): 525-538.  
    Abstract72)   HTML5)    PDF(pc) (797KB)(79)       Save

    In this paper we study exponential tractability of multivariate $\mathbb{L}_{\infty}$-approximation for weighted Korobov spaces in the worst case setting. We consider all algorithms that use the class $\Lambda^{\text{all}}$ of all linear functionals and the class $\Lambda^{\text{std}}$ of only function evaluations as information. We give matching necessary and sufficient conditions for notions of EC-quasi-polynomial tractability and EC-uniform weak tractability which have not been discussed before in terms of two weight parameters of the problem.

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    Dynamic Analysis and Optimal Control of an SIAQR Transmission Model with Asymptomatic Infection and Isolation
    Zhong Yi, Wang Yi, Jiang Tianhe
    Acta mathematica scientia,Series A    2023, 43 (6): 1914-1928.  
    Abstract70)   HTML3)    PDF(pc) (1460KB)(302)       Save

    This paper presents an epidemic model with asymptomatic infection and isolation in the context of population transmission of a Corona Virus Disease 2019 (COVID-19), we analyze the basic reproduction number of the model, the final epidemic size, the existence and uniqueness and solvability of the solution for the implicit final size equation. On this basis, we consider two possible control strategies and analyze the existence of optimal control by using the Filippov-Cesari existence theorem and Pontryagin extreme principle. Base on the historical data of COVID-19 infection in Zhejiang Province, the model parameters are estimated using the Markov Chain Monte Carlo method. The numerical simulation results show that the control strategy can reduce the peak isolation rate by 33.92% and final epidemic size by 76.54%. This suggests that reducing transmission rates and vaccinating susceptible individuals are still effective means of controlling the development of COVID-19 outbreaks, and provides recommendations for controlling COVID-19 outbreaks and responding to emerging infectious diseases.

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    Multiplicity and Asymptotic Behavior of Normalized Solutions for Kirchhoff-Type Equation
    Jin Zhenfeng, Sun Hongrui, Zhang Weimin
    Acta mathematica scientia,Series A    2024, 44 (4): 871-884.  
    Abstract69)   HTML4)    PDF(pc) (619KB)(56)       Save

    In this paper, we consider the following Kirchhoff-type equation

    $\begin{cases} -\left(a+b\int_{\mathbb{R}^{3}}|\nabla u|^{2}\ d x\right)\Delta u=\lambda u+|u|^{p-2}u \quad \mathrm{in}\ \mathbb{R}^{3},\\ \|u\|^2_{2}=\rho,\end{cases}$

    where $a$, $b$, $\rho>0$ and $\lambda\in\mathbb{R}$ arises as Lagrange multiplier with respect to the mass constraint $\|u\|^2_{2}=\rho$. When $p\in\left(2,\frac{10}{3}\right)$ or $p\in\left(\frac{14}{3},6\right)$, we establish the existence of infinitely many radial $L^2$-normalized solutions by using the genus theory. Furthermore, we testify an asymptotic behavior of the above solutions with respect to the parameter $b\rightarrow 0^+$.

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    Solitary and periodic solutions of the generalized b-equation
    Yong LIANG
    Acta mathematica scientia,Series A   
    Accepted: 26 January 2024