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The Inverse Problem of Symmetric Orthoantisymmetric Matrices HU Ti-Tan, ZHANG Lei, ZHOU Fu-Zhao Acta mathematica scientia,Series A    2004, 4 (5): 543-550.   Abstract （2138）      PDF（pc） （346KB）（5730）       Save Given P∈OR\+\{n×n satisfying  P\+T=P. Set  SAR\+n\-P={A∈R\+\{n×n|A\+T=A, (PA)\+T=-PA}. This paper discusses the following problems Problem Ⅰ〓Given X∈R\+\{n×m, Λ=diag(λ\-1,λ\-2, …, λ\-m)∈R\+\{m×m. Find A∈SAR\+n\-P such that AX=XΛ.Problem ⅡGiven B, X∈R\+\{n×m.Find A∈SAR\+n\-P such that ‖AX-B‖=min.Problem Ⅲ〓Given [AKA～]∈R\+\{n×n. FindA\+*∈S\-E such that‖[AKA～]-A\+*‖=inf[DD(X]A∈S\-E[DD)]‖[AKA～]-A‖ where S\-E is the solution set of Problem Ⅱ, ‖\5‖ is the Frobenius norm.The necessary and sufficient conditions for the solvability of  Problem Ⅰ have been studied. The general form of the solution set S\-E of Problem Ⅱ has been given. For Problem Ⅲ the expression of the solution A\+* has been provided. Reference | Related Articles | Metrics

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A Nonlinear Conjugate Gradient Method under Exact Line Search SHI Zhen-Jun Acta mathematica scientia,Series A    2004, 4 (6): 675-682.   Abstract （1713）      PDF（pc） （349KB）（3049）       Save The paper presents a nonlinear conjugate gradient method for unconstrained optimization problem, and proves its global convergence under exact line searches. The linear convergence rate is investigated when the objective function is uniformly convex. Numerical experiments show that the new algorithm is effective in practice. Reference | Related Articles | Metrics

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The Meaning of Quantum Finance CHEN Ze-Gan Acta mathematica scientia,Series A    2003, 23 (1): 115-128.   Abstract （1941）      PDF（pc） （483KB）（2986）       Save This paper is the sequel of the author's papers ［1］, ［2］, and ［3］. Quantum mechanics is involved to present a new version of hedging contingent claim The financial meaning of some results obtained in the sense of quantum theoryis studied. Finally, but not at last, the author tries his best to explain, in some details, why we should use quantum financial models in realworld financialmarkets. Reference | Related Articles | Metrics

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ON THE CROSSING NUMBER OF THE COMPLETE TRIPARTITE GRAPH K1,8,n Huang Yuanqiu; Zhao Tinglei Acta mathematica scientia,Series A    Abstract （1852）      PDF（pc） （204KB）（2390）       Save The well known Zarankiewicz' conjecture is said that the crossing number of the complete bipartite graph Km,n (m≤ n) is Z(m,n), where Z(m,n)=\lfloor\frac{m}{2}\rfloor\lfloor\frac{m-1}{2}\rfloor\lfloor\frac{n}{2}\rfloor$$\lfloor\frac{n-1}{2}\rfloor$ (for any real number x, $\lfloor x\rfloor$ denotes the maximal integer no more than x). Presently, Zarankiewicz' conjecture is proved true only for the case m≤ 6. In this article, the authors prove that if Zarankiewicz' conjecture holds for m≤ 9, then the crossing number of the complete tripartite graph K1,8,n is $Z(9, n)+ 12\lfloor\frac{n}{2}\rfloor$. Related Articles | Metrics

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Potential Function Model of Uniformity Measurement HU Dong-Hong, LI De-Hua, WANG Zu-Xi Acta mathematica scientia,Series A    2003, 23 (5): 607-612.   Abstract （1806）      PDF（pc） （450KB）（2365）       Save The basic characteristics that  any criterion of uniformity measurement  should have are discussed. According to the model of physics potential and forc e, a new criterion of uniformity measurement, potential function model of unifor mity measurement, is proposed. The model  not only can solve the problems suc h as  computability and the adjustable character for uniformity, but also has all the  good characters, which a uniformity measurement should have, such as rotation s ymmetry , translation symmetry and center reflection symmetry. An example is shown and  the uniformity of lower dimension projection is discussed at the end.   Reference | Related Articles | Metrics

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Research of the Motion Law on OneDimensional Relativistic Vibrator ZHU Ping Acta mathematica scientia,Series A    2004, 24 (1): 123-128.   Abstract （1476）      PDF（pc） （314KB）（2324）       Save American R Penfield and Chinese Zhou Lingyun have discussed the approximate solutions to the motion law on one dimensional relativistic vibrator. In this thesis, utilizing the elliptical integrals theory, the authors have obtained the analytic soluti ons and the vibration period on one dimensional relativistic vibrator. Reference | Related Articles | Metrics

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Approximation of Convex Functions on the Dual Spaces RUAN Ying-Ban, CHEN Shao-Xiong Acta mathematica scientia,Series A    2004, 24 (1): 116-122.   Abstract （1472）      PDF（pc） （354KB）（2202）       Save In this paper, the authors prove that for every w^* lower semicontinuous Lipschitzian convex function on the dual of a bistrictly convexifiable Banach space can be uniformly approximated by a  sequence of w^* lower semicontinuous monotone nondecreasing Lipschitzian convex function with the dense very smooth point  set. Reference | Related Articles | Metrics

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The Shock Solution for a Class of Nonlinear Equation HAN Xiang-Lin Acta mathematica scientia,Series A    2003, 23 (2): 253-256.   Abstract （1614）      PDF（pc） （292KB）（2192）       Save By using the matching asymptotic expanding method, the shock solutions  and their locations of a nonlinear equation are considered. And the relation of  them with the boundary conditions is obtained. Reference | Related Articles | Metrics

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Stability of Compacton Solutions and Backlund Transformation for One Type of Nonlinear Equations Yin Jiuli; Tian Lixin Acta mathematica scientia,Series A    Abstract （3080）      PDF（pc） （368KB）（2184）       Save Introducing K(m,n,1) equation with linear fifth-order dispersion, the authors obtain sin-compacton solutions by Adomian decomposition method. Using the homogeneous balance(HB) method, the authors obtain a Backlund transformation of a special equation K(2,2,1) to determine some new solitary solutions of the equation. The authors finally show the linear stability of all obtained sin-typed multi-compacton solutions. Related Articles | Metrics

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Some Properties on Currents in Metric Spaces Zhao Peibiao;Yang Xiaoping Acta mathematica scientia,Series A    Abstract （2949）      PDF（pc） （352KB）（2181）       Save The authors study the representation theorem of current by using the view of algebra. The similar Radon-Nikodym theorem for completely invariant current is obtained by virtue of the constructing minimal triple. Related Articles | Metrics

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Exponential Stability in Mean Square for Stochastic Hopfield Delay Neural Networks: an LMI Approach Chen Wuhua; Lu Xiaomei; Li Qunhong; Guan Zhihong Acta mathematica scientia,Series A    Abstract （2839）      PDF（pc） （344KB）（2116）       Save By using a technique of model transformation of the system, a new type of Lyapunov functional is introduced. By applying this new Lyapunov functional, a novel delay-dependent sufficient condition of exponential stability in mean square for stochastic Hopfield delay neural networks is derived in terms of linear matrix inequalities (LMIs). A delay-independent sufficient condition is also presented. Numerical examples show that the proposed method is less conservative than the previous ones. Related Articles | Metrics

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Generalized Inverses of Matrices on an Arbitrary Division Ring LIU Yong-Hui, SHU Chao, CHEN Guan-Liang Acta mathematica scientia,Series A

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Singular Perturbation for a Class of Reaction Diffusion Equation XIE Feng Acta mathematica scientia,Series A

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Factorization of Analytic Function of Order Less Than Deng Guantie Acta mathematica scientia,Series A    Abstract （2364）      PDF（pc） （220KB）（2071）       Save In this paper, the author proves that an analytic function of order less than 2 in a half plane can be factored into the product of the three functions: weighted Blaschke product, weighted singular inner function and weighted outer function. This is a generalization of the classical factorization about analytic functions in the Hardy space. Related Articles | Metrics

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Estimates of Upper Bounds of the Spectral Radius for Some Iteration Matrix CHEN Chao-Rong, LI Wen Acta mathematica scientia,Series A    2001, 21 (1): 8-13.   Abstract （1375）      PDF（pc） （312KB）（2066）       Save 该文对一类广义对角占优矩阵Ｍ，给出了迭代矩阵Ｍ－１Ｎ 的谱半径的上界．特别，当Ｍ是严格对角占优时，证明了所得到的估计值总比通常用作谱半径的估计值要好． Reference | Related Articles | Metrics

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不确定非线性系统的鲁棒自适应控制器 CHEN Wei-Tian, YAN Shi-Tian, ZHANG Zheng-Qiang, ZHU Feng-Chun Acta mathematica scientia,Series A    2002, 22 (2): 194-202.   Abstract （1407）      PDF（pc） （442KB）（2045）       Save 在ｂａｃｋｓｔｅｐｐｉｎｇ程序中，把非线性自适应控制和鲁棒控制连接起来，为参数化的严格反馈系统在不确定性存在的情况下，建立了一种鲁棒自适应控制方案．非线性自适应控制被用来处理系统的线性参数化部分，而鲁棒控制通过引进非线性阻尼项被用来处理不确定性部分．与现有的方案不同，作者给出了非线性阻尼项的无限种选择，而不是仅仅一种选择．通过使用一种合适的选择，能够设计一个鲁棒自适应控制器．它不仅能够保证对不确定性的鲁棒性，而且能够使输出误差任意小，以及用较小的控制努力取得较好的性能． Reference | Related Articles | Metrics

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Explicit Construction of Wavelet Tight Frames with Dilation factor α Huang Yongdong; Cheng Zhengxing Acta mathematica scientia,Series A    Abstract （2407）      PDF（pc） （337KB）（1928）       Save This paper studies wavelet tight frames associated with given scaling functions with dilatin factor α. The wavelet tight frames consist of finite number of functions ψ1,ψ2,...,ψn. First, the authors present sufficient conditions for existence of wavelet tight frames generated by the n functions, then give explicit constructing formula of wavelet tight frames. In particular, if mask of the scaling function are rational functions, the mask of the corresponding wavelet tight frames are rational. Finally, the paper derive the decomposition and reconstruction formulas, and give five numercial examples of wavelet tight frames. Related Articles | Metrics

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Entropy of Cylindrical Black Hole ZHANG Zi-Zhen, ZHANG Li-Chun,ZHAO Ren Acta mathematica scientia,Series A    2005, 25 (7): 1061-1066.   Abstract （1796）      PDF（pc） （318KB）（1920）       Save Using the new equation of state density motivated by the generalized uncertainty relation, the authors  derive the entropy of the black cylinder on the background of the cylindrically symmetric spacetime. When the new equation of state density is utilized to obtain that the entropy of the black cylinder is proportional to the horizon area, the divergence appearing in the brick wall model is removed, without any cutoff. It is shown that black cylinder's entropy is the entropy of quantum state on the surface of horizon. The black cylinder's entropy is a kind  of quantum effect. It is the intrinsic property of the black cylinder. Via the method of quantum statistics, the authors  directly derive the partition functions of Bosonic and Fermi field in black cylinder. The authors  also avoid the difficult to solve the wave equation of various particles. The authors  offer a new simple and direct way of calculating the entropy of black cylinders of different complicated spacetime. Reference | Related Articles | Metrics

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Positive Solutions to Some Nonlinear Eigenvalue Problems of ThirdOrder Ordinary Differential Equations YAO Qing-Liu Acta mathematica scientia,Series A    2003, 23 (5): 513-519.   Abstract （1912）      PDF（pc） （337KB）（1918）       Save Some nonlinear eigenvalue problems of third order ordinary differential equations are investigated. By considering the properties of nonlinear terms on bounded sets, the existence and multiplicity of these problems a reestablished. Reference | Related Articles | Metrics

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On Singular Directions of |Meromorphic Algebroidal Functions ZHANG Hong-Shen Acta mathematica scientia,Series A    2009, 29 (6): 1642-1650.   Abstract （1718）      PDF（pc） （275KB）（1914）       Save Let w(z) be a meromorphic algebroidal   function  for |z|<+∞. If limr →∞lg T(r, w)/lg r =0,  limr →∞lg T(r, w)/lg lg r =+∞, then there exists a direction arg z=θ0 such that, for any N>0, ∑i1/(lg|zi(a; ?(θ0, δ))|)N=+∞, with 2 v possible exceptions for a. If limr →∞T(r, w)/lgKr =+∞,  limr →∞lg T(r, w)/lg lg r =M, then there exists a direction arg z=θ0 such that ∑i 1/lg|zi(a; ?(θ0, δ))|)σ=∞ (σ=M-2 or σ=M-2-ε), with 2 v possible exceptions for a. For meromorphic functions, these singular directions have not been studied yet. Reference | Related Articles | Metrics