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    Stability and Hopf Bifurcation of an Eco-Epidemiological Model with Delay
    BAI Hong-fang
    Chinese Quarterly Journal of Mathematics    2023, 38 (2): 157-183.   DOI: 10.13371/j.cnki.chin.q.j.m.2023.02.005
    Abstract148)      PDF(pc) (1289KB)(196)       Save
    In this paper, an eco-epidemiological model with time delay is studied. The local stability of the four equilibria, the existence of stability switches about the predation- free equilibrium and the coexistence equilibrium are discussed. It is found that Hopf bifurcations occur when the delay passes through some critical values. Formulae are obtained to determine the direction of bifurcations and the stability of bifurcating periodic solutions by using the normal form theory and center manifold theorem. Some numerical simulations are carried out to illustrate the theoretical results.
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    Differential Identities in Prime Rings with Involution
    HUANG Shu-liang
    Chinese Quarterly Journal of Mathematics    2023, 38 (2): 134-144.   DOI: 10.13371/j.cnki.chin.q.j.m.2023.02.003
    Abstract118)      PDF(pc) (319KB)(183)       Save
    Let R be a prime ring of characteristic different from two with the sec- ond involution ∗ and α an automorphism of R . An additive mapping F of R is called a generalized ( α,α )-derivation on R if there exists an ( α,α )-derivation d of R such that F ( xy )= F ( x ) α ( y )+ α ( x ) d ( y ) holds for all x,y∈R. The paper deals with the s- tudy of some commutativity criteria for prime rings with involution. Precisely, we describe the structure of R admitting a generalized ( α,α )-derivation F satisfying any one of the following properties:
    ( i ) F ( xx) −α ( xx) ∈Z ( R ).
    ( ii ) F ( xx )+ α ( xx ) ∈Z ( R ).
    ( iii ) F ( x ) F ( xx) −α ( xx) ∈Z ( R ).
    ( iv ) F ( x ) F (x)+ α ( xx) ∈Z ( R ).
    ( v ) F ( xx) −F ( x ) F (x ) ∈Z ( R ).
    ( vi ) F ( xx) −F (x) F ( x )=0
    for all x∈R . Also, some examples are given to demonstrate that the restriction of the various results is not superfluous. In fact, our results unify and extend several well known theorems in literature.
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    Initial Boundary Value Problem for Pseudo-Parabolic p-Laplacian Type Equation with Logarithmic Nonlinearity
    PAN Jia-hui, FANG Shao-mei
    Chinese Quarterly Journal of Mathematics    2023, 38 (4): 360-369.   DOI: 10.13371/j.cnki.chin.q.j.m.2023.04.003
    Abstract77)      PDF(pc) (358KB)(162)       Save
     In this paper, we study the initial boundary value problem of pseudo-parabolic p-Laplacian type equation, which be use to model some important physical and biological phenomena. By using the potential well method, we obtain the global existence, asymptotic behavior and blow up results of weak solution with subcritical initial energy. Then we also extend these results to the critical initial energy.
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    Hopf-Rinow Theorem on Convex Complex Finsler Manifolds
    LI Hong-jun
    Chinese Quarterly Journal of Mathematics    2024, 39 (1): 31-45.   DOI: 10.13371/j.cnki.chin.q.j.m.2024.01.003
    Abstract122)      PDF(pc) (365KB)(132)       Save
    Suppose (M,F) is a convex complex Finsler manifold. We prove that geodesics of (M,F) are locally minimizing. Hence, F introduces a distance function d such that (M,d) is a metric space from topology. Next, we prove the classical Hopf-Rinow Theorem holds on (M,F).
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    Some Applications of Surface Curvatures in Theoretical Physics
    YANG Yi-song
    Chinese Quarterly Journal of Mathematics    2023, 38 (3): 221-253.   DOI: 10.13371/j.cnki.chin.q.j.m.2023.03.001
    Abstract381)      PDF(pc) (496KB)(127)       Save
    In this survey article, we present two applications of surface curvatures in theoretical physics. The first application arises from biophysics in the study of the shape of cell vesicles involving the minimization of a mean curvature type energy called the Helfrich bending energy. In this formalism, the equilibrium shape of a cell vesicle may present itself in a rich variety of geometric and topological characteristics. We first show that there is an obstruction, arising from the spontaneous curvature, to the existence of a minimizer of the Helfrich energy over the set of embedded ring tori. We then propose a scale-invariant anisotropic bending energy, which extends the Canham energy, and show that it possesses a unique toroidal energy minimizer, up to rescaling, in all parameter regime. Furthermore, we establish some genus-dependent topological lower and upper bounds, which are known to be lacking with the Helfrich energy, for the proposed energy. We also present the shape equation in our context, which extends the Helfrich shape equation. The second application arises from astrophysics in the search for a mechanism for matter accretion in the early universe in the context of cosmic strings. In this formalism, gravitation may simply be stored over a two-surface so that the Einstein tensor is given in terms of the Gauss curvature of the surface which relates itself directly to the Hamiltonian energy density of the matter sector. This setting provides a lucid exhibition of the interplay of the underlying geometry, matter energy, and topological characterization of the system. In both areas of applications, we encounter highly challenging nonlinear partial differential equation problems. We demonstrate that studies on these equations help us to gain understanding of the theoretical physics problems considered.
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    On the Stokes Phenomenon and Representation Theory of Quantum Groups
    XU Xiao-meng
    Chinese Quarterly Journal of Mathematics    2023, 38 (3): 311-330.   DOI: 10.13371/j.cnki.chin.q.j.m.2023.03.005
    Abstract81)      PDF(pc) (458KB)(126)       Save
    This is a survey paper that lists our research works in the study of Stokes phenomenon of meromorphic ordinary differential equations and its relation with representation theory of quantum groups
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    The Least Squares {P,Q,k+1}-Reflexive Solution to a Matrix Equation
    DONG Chang-zhou, LI Hao-xue
    Chinese Quarterly Journal of Mathematics    2023, 38 (2): 210-220.   DOI: 10.13371/j.cnki.chin.q.j.m.2023.02.008
    Abstract97)      PDF(pc) (383KB)(125)       Save
     Let P ∈C m×m and Q∈C n×n be Hermitian and {k +1 } -potent matrices,
    i.e., P k+1 = P = P ∗ , Q k+1 = Q = Q ∗ , where ( · ) ∗ stands for the conjugate transpose of a
    matrix. A matrix X ∈C m×n is called {P,Q,k +1 } -reflexive (anti-reflexive) if PXQ = X
    ( PXQ = −X ). In this paper, the least squares solution of the matrix equation AXB = C
    subject to {P,Q,k +1 } -reflexive and anti--reflexive constraints are studied by converting
    into two simpler cases: k=1 and k=2.
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    The Semi-Convergence Properties of the Generalized Shift-Splitting Methods for Singular Saddle Point Problems
    HUANG Zhuo-Hong
    Chinese Quarterly Journal of Mathematics    2023, 38 (2): 145-156.   DOI: 10.13371/j.cnki.chin.q.j.m.2023.02.004
    Abstract90)      PDF(pc) (300KB)(119)       Save
    Recently, some authors (Shen and Shi, 2016) studied the generalized shift- splitting (GSS) iteration method for singular saddle point problem with nonsymmetric positive definite (1,1)-block and symmetric positive semidefinite (2,2)-block. In this paper, we further apply the GSS iteration method to solve singular saddle point problem with nonsymmetric positive semidefinite (1,1)-block and symmetric positive semidefinite (2,2)-block, prove the semi-convergence of the GSS iteration method and analyze the spectral properties of the corresponding preconditioned matrix. Numerical experiment is given to indicate that the GSS iteration method with appropriate iteration parameters is effective and competitive for practical use.
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    A New Existence Theorem for Global Attractors and its Application to a Non-Classical Diffusion Equation
    QIN Yu-ming, CHEN Jia-le, JIANG Hui-te
    Chinese Quarterly Journal of Mathematics    2023, 38 (3): 276-289.   DOI: 10.13371/j.cnki.chin.q.j.m.2023.03.003
    Abstract107)      PDF(pc) (364KB)(117)       Save
    In this paper, we first survey existed theorems and propose all 46 related open problems of the existence of global attractors for autonomous dynamical systems, then establish a new existence theorem of global attractors which will be applied to a nonclassical diffusion equation for the norm-to-weak continuous, weakly compact semigroup on H01(Ω) and H2(Ω)∩H01(Ω) respectively. As an application of this new existence theorem of global attractors, we obtain the existence of the global attractors onH01(Ω) and H2(Ω)∩ H01(Ω) respectively for a nonclassical-diffusion equation.
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    The Existence of Normalized Solution to the Kirchhoff#br# Equation with Potential#br#
    LIANG Yan-xia
    Chinese Quarterly Journal of Mathematics    2023, 38 (2): 196-209.   DOI: 10.13371/j.cnki.chin.q.j.m.2023.02.007
    Abstract181)      PDF(pc) (378KB)(117)       Save

     In this paper we discuss the following Kirchhoff equation

    \left\{
    \begin{array}{lr}
    -\left(a+b \int_{\mathbb{R}^3}|\nabla u|^{2} d x\right) \Delta u+V(x)u+\lambda u=\mu|u|^{q-2}u+|u|^{p-2}u \ {\rm in}\ \mathbb{R}^3,&\\
    \int_{\mathbb{R}^{3}}u^{2}dx=c^2,
    \end{array}
    \right.
    where a, b, µ and c are positive numbers, λ is unknown and appears as a Lagrange multiplier,

    14/3<q<p<6 and V is a continuous non-positive function vanishing at infinity.
    Under some mild assumptions on V , we prove the existence of a mountain pass normalized solution. To the author’s knowledge, it is the first time to study the existence of
    normalized solution to Kirchhoff equation with potential via the minimax principle.
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    The Explicit Formula for the Moore-Penrose Inverse of a 2×2 Block Matrix
    ZENG Min, YUAN Yong-xin
    Chinese Quarterly Journal of Mathematics    2023, 38 (4): 401-409.   DOI: 10.13371/j.cnki.chin.q.j.m.2023.04.007
    Abstract71)      PDF(pc) (347KB)(114)       Save
    The representation for the Moore-Penrose inverse of the matrix
    A B
    C D 
    is derived by using the solvability theory of linear equations, where A∈Cm×n, B∈Cm×p, C∈Cq×n and D∈Cq×p, with which some special cases are discussed.
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    Some New Regularity Criteria for the 3D Boussinesq Equations in Homogeneous Besov Spaces
    ZOU Mian-lu, LI Qiang
    Chinese Quarterly Journal of Mathematics    2024, 39 (1): 73-81.   DOI: 10.13371/j.cnki.chin.q.j.m.2024.01.007
    Abstract104)      PDF(pc) (355KB)(111)       Save
    In this paper, we study the regularity criterion for the three-dimensional Boussinesq equations in Besov spaces. We show that the smooth solution (u,θ) is regular if the horizonal velocity uh holds
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    Harvesting in a Toxic Predator-Prey Model with Carrying Capacity and Maturation Double Delays
    ZHONG Ying, WEI Yu-ming
    Chinese Quarterly Journal of Mathematics    2023, 38 (4): 331-348.   DOI: 10.13371/j.cnki.chin.q.j.m.2023.04.001
    Abstract134)      PDF(pc) (589KB)(99)       Save
     In this paper, a model of predator-prey with dual delay in maturation and carrying capacity is discussed, in which the past activity of the prey should have an impact on the carrying capacity, the mature prey initiates defense mechanisms to release toxins when subjected to predation, and a commercial harvest of the prey is performed. The stability of the equilibrium of the system in the absence of delay is examined and the optimal harvesting strategy of the model is proven. By investigating the roots of the characteristic equation and applying normalized theory, the properties of the coexistence equilibrium of the system and the conditions for the occurrence of the Hopf bifurcation in the neighborhood of the positive equilibrium are described for various combinations of delays. In the end, numerical simulations are used to verify theoretical analysis results.
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    Maximal Resonance of {(3,4),4}-Fullerene Graphs
    YANG Rui, MA Yan-fei
    Chinese Quarterly Journal of Mathematics    2024, 39 (1): 1-17.   DOI: 10.13371/j.cnki.chin.q.j.m.2024.01.001
    Abstract115)      PDF(pc) (551KB)(97)       Save
    A {(3,4),4}-fullerene graph S is a 4-regular map on the sphere whose faces are of length 3 or 4. It follows from Euler’s formula that the number of triangular faces is eight. A set H of disjoint quadrangular faces of S is called resonant pattern if S has a perfect matching M such that every quadrangular face in H is M-alternating. Let k be a positive integer, S is k-resonant if any i≤k disjoint quadrangular faces of S form a resonant pattern. Moreover, if graph S is k-resonant for any integer k, then S is called maximally resonant.
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    Blow-Up and Decay Estimate in a Logarithmic p-Laplace Parabolic Equation
    LI Ping, LI Feng-jie
    Chinese Quarterly Journal of Mathematics    2024, 39 (4): 331-354.   DOI: 10.13371/j.cnki.chin.q.j.m.2024.04.001
    Abstract187)      PDF(pc) (462KB)(96)       Save
    This paper deals with an initial-boundary value problem of a fourth-order parabolic equation involving Logarithmic type p-Laplacian, which could be proposed as a model for the epitaxial growth of thin films. By using the variational method and the
    logarithmic type Sobolev inequality, we give some threshold results for blow-up solutions and global solutions, which could be classified by the initial energy. The asymptotic estimates about blow-up time and decay estimate of weak solutions are obtained.
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    Implicit Finite Difference Method for Time-Space Caputo-Riesz Fractional Diffusion Equation with Fractional Robin Boundary Conditions
    TANG Zhong-hua, FANG Shao-mei
    Chinese Quarterly Journal of Mathematics    2024, 39 (1): 18-30.   DOI: 10.13371/j.cnki.chin.q.j.m.2024.01.002
    Abstract121)      PDF(pc) (366KB)(86)       Save
    In this paper, an efficient numerical method is proposed to solve the Caputo-Riesz fractional diffusion equation with fractional Robin boundary conditions. We approximate the Riesz space fractional derivatives using the fractional central difference scheme with second-order accurate. A priori estimation of the solution of the numerical scheme is given, and the stability and convergence of the numerical scheme are analyzed. Finally, a numerical example is used to verify the accuracy and efficiency of the numerical method.
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    Some Applications of Group Actions in Complex Geometry
    GUAN Daniel
    Chinese Quarterly Journal of Mathematics    2023, 38 (3): 254-275.   DOI: 10.13371/j.cnki.chin.q.j.m.2023.03.002
    Abstract139)      PDF(pc) (399KB)(86)       Save
    In this article, we give a further survey of some progress of the applications of group actions in the complex geometry after my earlier survey around 2020, mostly related to my own interests.
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    Global Well-Posedness of the Initial-Boundary Value Problem on Incompressible MHD-Boussinesq Equations with Nonlinear Boundary Conditions
    WANG Shu, SUN Rui
    Chinese Quarterly Journal of Mathematics    2023, 38 (3): 290-310.   DOI: 10.13371/j.cnki.chin.q.j.m.2023.03.004
    Abstract91)      PDF(pc) (400KB)(79)       Save
    The global well-posedness of another class of initial-boundary value problem on two/three-dimensional incompressible MHD-Boussinesq equations in the bounded domain with the smooth boundary is studied. The existence of a class of global weak solution to the initial boundary value problem for two/three-dimensional incompressible MHD-Boussinesq equation with the given pressure-velocity’s relation boundary condition for the fluid field, one generalized perfectly conducting boundary condition for the magnetic field and one density/temperature-velocity’s relation boundary condition for the density/temapture at the boundary is obtained, and the global existence and uniqueness of the smooth solution to the corresponding problem in two-dimensional case for the smooth initial data is also proven.
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    Boundedness of Integral and Discrete Operators Between Two Types of Weighted Spaces and Estimation of Operator Norm
    HONG Yong, ZHAO Qian
    Chinese Quarterly Journal of Mathematics    2024, 39 (1): 59-67.   DOI: 10.13371/j.cnki.chin.q.j.m.2024.01.005
    Abstract80)      PDF(pc) (330KB)(79)       Save
    Using the weight coefficient method, we first discuss semi-discrete Hilbert-type inequalities, and then discuss boundedness of integral and discrete operators and operator norm estimates based on Hilbert-type inequalities in weighted Lebesgue space and weighted normed sequence space.
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    Construction of a Class of Gerstenhaber Algebras
    HOU Bo, KOU Wen
    Chinese Quarterly Journal of Mathematics    2023, 38 (4): 370-378.   DOI: 10.13371/j.cnki.chin.q.j.m.2023.04.004
    Abstract84)      PDF(pc) (320KB)(78)       Save
    For any K-algebra A, based on Hochschild complex and Hochschild cohomology of A, we construct a new Gerstenhaber algebra, and give Gerstenhaber algebra epimorphism from the new Gerstenhaber algebra to the Gerstenhaber algebra of the Hochschild cohomology of A.
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