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    20 October 2007, Volume 27 Issue 4 Previous Issue    Next Issue
    Articles
    NONTRIVIAL SOLUTIONS OF HARDY-HENON TYPE ELLIPTIC SYSTEMS
    Liu Fang; Yang Jianfu
    Acta mathematica scientia,Series B. 2007, 27 (4):  673-688.  DOI: 10.1016/S0252-9602(07)60067-8
    Abstract ( 1094 )   RICH HTML PDF (208KB) ( 1435 )   Save

    In this article, the authors investigate the existence problem for Hardy--Henon type strongly indefinite elliptic systems. Existence results are obtained for such systems with superlinear subcritical nonlinearities.

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    COMPLEX POWER OF HERMITE OPERATOR
    Ding Xiaqi; Luo Peizhu
    Acta mathematica scientia,Series B. 2007, 27 (4):  689-693.  DOI: 10.1016/S0252-9602(07)60068-X
    Abstract ( 954 )   RICH HTML PDF (117KB) ( 1204 )   Save

    In this paper the authors define complex power of Hermite operator and give some applications in Riemann Zeta function.

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    EXTENSION OF SOLUTIONS TO RIEMANN BOUNDARY VALUE PROBLEMS AND ITS APPLICATION
    Lu Jianke
    Acta mathematica scientia,Series B. 2007, 27 (4):  694-702.  DOI: 10.1016/S0252-9602(07)60069-1
    Abstract ( 1100 )   RICH HTML PDF (156KB) ( 1041 )   Save

    In this paper, solutions of Riemann boundary value problems with nodes
    are extended to the case where they may have singularties of high order at the nodes. Moreover, further extension is discussed when the free term of the problem involved also possesses singularities at the nodes. As an application, certain singular integral equation is discussed.

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    BLOW-UP RESULTS AND ASYMPTOTIC BEHAVIOR OF THE EMDEN-FOWLER EQUATION u''=|u|p
    Li Mengrong
    Acta mathematica scientia,Series B. 2007, 27 (4):  703-734.  DOI: 10.1016/S0252-9602(07)60070-8
    Abstract ( 1258 )   RICH HTML PDF (512KB) ( 1004 )   Save

    In this article the author works with the ordinary differential equation
    u''=|u|p for some p>0 and obtains some interesting phenomena
    concerning blow-up, blow-up rate, life-span, stability, instability, zeros and
    critical points of solutions to this equation.

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    DISAPPEARANCE OF INTERFACES FOR DEGENERATE PARABOLIC EQUATIONS WITH VARIABLE DENSITY AND ABSORPTION
    Hu Xuegang; Mu Chunlai
    Acta mathematica scientia,Series B. 2007, 27 (4):  735-742.  DOI: 10.1016/S0252-9602(07)60071-X
    Abstract ( 1201 )   RICH HTML PDF (151KB) ( 1235 )   Save

    In this article, the authors deal with the Cauchy problem of a nonlinear parabolic equation with variable density and absorption. By using energy methods, the authors prove that the interfaces can disappear in finite time under some assumptions on the density functions.

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    ON THE DEPENDENT PROPERTY OF SOLUTIONS FOR HIGHER ORDER PERIODIC #br# DIFFERENTIAL EQUATIONS
    Chen Zongxuan; Gao Shi'an; Shon Kwang Ho
    Acta mathematica scientia,Series B. 2007, 27 (4):  743-752.  DOI: 10.1016/S0252-9602(07)60072-1
    Abstract ( 1104 )   RICH HTML PDF (181KB) ( 1453 )   Save

    This article investigates the property of linearly dependence of solutions f(z) and f(z+2πi) for higher order linear differential equations with entire periodic coefficients.

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    A COMPREHENSIVE PROOF OF THE GREENBERGER-HORNE-ZEILINGER THEOREM FOR THE FOUR-QUBIT SYSTEM
    Tang Li; Chen Zeqian; Zhong Jie; Ren Yaofeng; Zhan Mingsheng
    Acta mathematica scientia,Series B. 2007, 27 (4):  753-776.  DOI: 10.1016/S0252-9602(07)60073-3
    Abstract ( 1012 )   RICH HTML PDF (228KB) ( 1052 )   Save

    Greenberger--Horne--Zeilinger (GHZ) theorem asserts that there is a
    set of mutually commuting nonlocal observables with a common
    eigenstate on which those observables assume values that refute
    the attempt to assign values only required to have them by the
    local realism of Einstein, Podolsky, and Rosen (EPR). It is known
    that for a three-qubit system, there is only one form of the
    GHZ-Mermin-like argument with equivalence up to a local unitary
    transformation, which is exactly Mermin's version of the GHZ
    theorem. This article for a four-qubit system, which was
    originally studied by GHZ, the authors show that there are nine distinct
    forms of the GHZ-Mermin-like argument. The proof is obtained
    using certain geometric invariants to characterize the sets of
    mutually commuting nonlocal spin observables on the four-qubit
    system. It is proved that there are at most nine elements (except
    for a different sign) in a set of mutually commuting nonlocal spin
    observables in the four-qubit system, and each GHZ-Mermin-like
    argument involves a set of at least five mutually commuting
    four-qubit nonlocal spin observables with a GHZ state as a common
    eigenstate in GHZ's theorem. Therefore, we present a complete
    construction of the GHZ theorem for the four-qubit system.

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    ASYMPTOTIC METHOD OF TRAVELLING WAVE SOLUTIONS FOR A CLASS OF #br# NONLINEAR REACTION DIFFUSION EQUATION
    Mo Jiaqi; Zhang Weijiang; He Ming
    Acta mathematica scientia,Series B. 2007, 27 (4):  777-780.  DOI: 10.1016/S0252-9602(07)60074-5
    Abstract ( 1109 )   RICH HTML PDF (116KB) ( 1462 )   Save

    In this article the travelling wave solution for a class of nonlinear reaction diffusion problems are considered. Using the homotopic method and the theory of travelling wave transform, the approximate solution for the corresponding problem is obtained.

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    PROJECTIVELY FLAT MATSUMOTO METRIC AND ITS APPROXIMATION
    Li Benling
    Acta mathematica scientia,Series B. 2007, 27 (4):  781-789.  DOI: 10.1016/S0252-9602(07)60075-7
    Abstract ( 1117 )   RICH HTML PDF (152KB) ( 2224 )   Save

    In this article, the author studies the projectively flat Matsumoto metric F=α2/(α-β), where α=\sqrt{a_{ij}y^{i}y^{j}} is a Riemannian metric and β=biyi is a 1-form. They conclude that α is locally projectively flat and β is paralled with respect to α. And get the same result for the higher order approximate Matsumoto metric.

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    TRACTABILITY OF MULTIVARIATE INTEGRATION PROBLEM FOR PERIODIC CONTINUOUS FUNCTIONS
    Fang Gensun; Long Jingfan
    Acta mathematica scientia,Series B. 2007, 27 (4):  790-802.  DOI: 10.1016/S0252-9602(07)60076-9
    Abstract ( 1112 )   RICH HTML PDF (195KB) ( 1046 )   Save

    The authors study the tractability and strong tractability of a multivariate integration problem in the worst case setting for weighted 1-periodic continuous functions spaces of d coordinates with absolutely convergent Fourier series. The authors reduce the initial error by a factor ε for functions from the unit ball of the weighted periodic continuous functions spaces. Tractability is the minimal number of function samples required to solve the problem in polynomial in ε-1 and d, and the strong tractability is the presence of only a polynomial dependence in ε-1. This problem has been recently studied for quasi-Monte Carlo quadrature rules, quadrature rules with non-negative coefficients, and rules for which all quadrature weights are arbitrary for weighted Korobov spaces of smooth periodic functions of d variables. The authors show that the tractability and strong tractability of a multivariate integration problem in worst case setting hold for the weighted periodic
    continuous functions spaces with absolutely convergent Fourier series under the same assumptions as in Ref.[14] on the weights of the Korobov space for quasi-Monte Carlo rules and rules for which all quadrature weights are non-negative. The arguments are not constructive.

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    ON THE SHARP GROWTH, COVERING THEOREMS FOR NORMALIZED BIHOLOMORPHIC MAPPINGS IN Cn
    Liu Xiaosong; Liu Taishun
    Acta mathematica scientia,Series B. 2007, 27 (4):  803-812.  DOI: 10.1016/S0252-9602(07)60077-0
    Abstract ( 1162 )   RICH HTML PDF (176KB) ( 1185 )   Save

    In this article, a normalized biholomorphic mapping f defined on bounded starlike circular domain in Cn is considered, where z=0 is a zero of order k+1 of f(z)-z. The sharp growth, covering theorems for almost starlike mappings of order α and starlike mappings of order α are established. Meanwhile, the
    construction of the above mappings on bounded starlike circular domain in Cn is also discussed, it provides the extremal mappings for the growth, covering theorems of the above mappings.

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    A NEGATIVE ANSWER TO A PROBLEM OF FREMLIN AND MENDOZA
    Ye Guoju; Stefan Schwabik
    Acta mathematica scientia,Series B. 2007, 27 (4):  813-820.  DOI: 10.1016/S0252-9602(07)60078-2
    Abstract ( 1015 )   RICH HTML PDF (154KB) ( 1023 )   Save

    This article studies some convergence results for the McShane integral of functions mapping the interval [0, 1] into a Banach space X from the point of view of an open problem proposed by D.H.Fremlin and J. Mendoza in [2], also the anthors give a negative answer to this open problem.

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    LARGE DEVIATION FOR THE EMPIRICAL CORRELATION COEFFICIENT OF TWO GAUSSIAN RANDOM VARIABLES
    Shen Si
    Acta mathematica scientia,Series B. 2007, 27 (4):  821-828.  DOI: 10.1016/S0252-9602(07)60079-4
    Abstract ( 1188 )   RICH HTML PDF (166KB) ( 1629 )   Save

    In this article, the author obtains the large deviation principles for the
    empirical correlation coefficient of two Gaussian random variables
    X and Y. Especially, when considering two independent Gaussian
    random variables X, Y with the means EX, EY (both known), wherein the author gives two kinds of different proofs and gets the same results.

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    STRONG LAW OF LARGE NUMBERS AND ASYMPTOTIC EQUIPARTITION PROPERTY FOR NONSYMMETRIC MARKOV CHAIN FIELDS ON CAYLEY TREES
    Bao Zhenhua; Ye Zhongxing
    Acta mathematica scientia,Series B. 2007, 27 (4):  829-837.  DOI: 10.1016/S0252-9602(07)60080-0
    Abstract ( 1179 )   RICH HTML PDF (156KB) ( 1301 )   Save

    Some strong laws of large numbers for the frequencies of occurrence of states and ordered couples of states for nonsymmetric Markov chain fields
    (NSMC) on Cayley trees are studied. In the proof, a new technique for the study of strong limit theorems of Markov chains is extended to the case of Markov chain fields. The asymptotic equipartition properties with almost everywhere (a.e.) convergence for NSMC on Cayley trees are obtained.

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    ON A GENERALIZED MODULUS OF CONVEXITY AND UNIFORM NORMAL STRUCTURE
    Yang Changsen; Wang Fenghui
    Acta mathematica scientia,Series B. 2007, 27 (4):  838-844.  DOI: 10.1016/S0252-9602(07)60081-2
    Abstract ( 1057 )   RICH HTML PDF (147KB) ( 1789 )   Save

    In this article, the authors study a generalized modulus of convexity, δα(ε). Certain related geometrical properties of this modulus are analyzed. Their main result is that Banach space X has uniform normal structure if there exists ε, 0≤ε≤1, such that δα(1+ε)>(1-α)ε.

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    MEROMORPHIC FUNCTIONS SHARING TWO FINITE SETS
    Lin Weichuan; Yi Hongxun
    Acta mathematica scientia,Series B. 2007, 27 (4):  845-851.  DOI: 10.1016/S0252-9602(07)60082-4
    Abstract ( 1224 )   RICH HTML PDF (144KB) ( 1430 )   Save

    Let S1={∞} and S2={w: Ps(w)=0}, Ps(w) being a uniqueness polynomial under some restricted conditions. Then, for any given nonconstant meromorphic function f, there exist at most finitely many nonconstant meromorphic functions g such that f-1(Si)=g-1(Si), (i=1,2), where f-1(Si) and g-1(Si)$ denote the pull-backs of Si considered as a divisor, namely, the inverse images of Si counted with multiplicities, by f and g respectively.

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    BOUNDEDNESS OF GENERALIZED HIGHER COMMUTATORS OF MARCINKIEWICZ INTEGRALS
    Mo Huixia; Lu Shanzhen
    Acta mathematica scientia,Series B. 2007, 27 (4):  852-866.  DOI: 10.1016/S0252-9602(07)60083-6
    Abstract ( 1253 )   RICH HTML PDF (219KB) ( 1592 )   Save

    Let $\vec{b}=(b_{1},\cdots ,b_{m})$ be a finite family of locally
    integrable functions. Then, we introduce generalized higher commutator of Marcinkiwicz integral as follows:
    $$\mu_{\Omega}^{\vec{b}}(f)(x)=\Bigl(\int_{0}^{\infty}
    |F_{\Omega,t}^{\vec{b}}(f)(x)|^{2}\frac{{\rm d}t}{t}\Bigr)^{1/2},$$ where
    $$F_{\Omega,t}^{\vec{b}}(f)(x)=\frac{1}{t}\int_{|x-y|\leq t}
    \frac{\Omega(x-y)}{|x-y|^{n-1}}\prod\limits_{j=1}^{m}(b_{j}(x)-b_{j}(y))f(y){\rm d}y.$$
    When $b_{j}\in\dot{\Lambda}_{\beta_{j}}, 1\leq j\leq m,$
    $0<\beta_{j}<1, \sum\limits_{j=1}^{m}\beta_{j}=\betais homogeneous of degree zero and satisfies the cancelation condition, we prove that $\mu_{\Omega}^{\vec{b}}$ is bounded from
    $L^{p}({\Bbb R}^{n})$ to $L^{s}({\Bbb R}^{n}),$ where
    $1Moreover, if $\Omega$ also satisfies some Lq-Dini condition, then
    $\mu_{\Omega}^{\vec{b}}$ is bounded from $L^{p}({\Bbb R}^{n})$ to
    $\dot{F}^{\beta,\infty}_{p}({\Bbb R}^{n})$ and on certain Hardy spaces.
    The article extends some known results.

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    THE SPHERICAL FUNCTIONS AND THE CENTRAL LIMIT THEOREM ON SU(2,2)/S(U(2)×U(2))
    Yang Qiaohua; Zhang Qin
    Acta mathematica scientia,Series B. 2007, 27 (4):  867-874.  DOI: 10.1016/S0252-9602(07)60084-8
    Abstract ( 1162 )   RICH HTML PDF (179KB) ( 973 )   Save

    Let G=SU(2,2), K=S(U(2)×U(2)), and for l∈Z, let {τl}l∈Z be a one-dimensional K-type and let El be the line bundle over G/K associated to τl. It is shown that the τl-spherical function on G is given by the hypergeometric functions of several variables. By applying this result, a central limit theorem for the space G/K is obtained.

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    A FINITE ELEMENT COLLOCATION METHOD FOR TWO-PHASE INCOMPRESSIBLE#br# IMMISCIBLE PROBLEMS
    Ma Ning
    Acta mathematica scientia,Series B. 2007, 27 (4):  875-885.  DOI: 10.1016/S0252-9602(07)60085-X
    Abstract ( 1153 )   RICH HTML PDF (176KB) ( 2052 )   Save

    Two-phase, incompressible, immiscible flow in porous media is governed by a coupled system of nonlinear partial differential equations. The pressure equation is elliptic, whereas the concentration equation is parabolic, and both are treated by the collocation scheme. Existence and uniqueness of
    solutions of the algorithm are proved. A optimal convergence analysis is given for the method.

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    LARGE DEVIATIONS AND MODERATE DEVIATIONS FOR m-NEGATIVELY ASSOCIATED RANDOM VARIABLES
    Hu Yijun; Ming Ruixing; Yang Wenquan
    Acta mathematica scientia,Series B. 2007, 27 (4):  886-896.  DOI: 10.1016/S0252-9602(07)60086-1
    Abstract ( 1263 )   RICH HTML PDF (184KB) ( 1305 )   Save

    M-negatively associated random variables, which generalizes the classical one of negatively associated random variables and includes m-dependent sequences as its particular case, are introduced and studied. Large
    deviation principles and moderate deviation upper bounds for stationary m-negatively associated random variables are proved. Kolmogorov-type and Marcinkiewicz-type strong laws of large numbers as well as the three series theorem for m-negatively associated random variables are also given.

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    ANOTHER TYPE OF GENERALIZED BALL CURVES AND SURFACES
    Yu Dan; Chen Xinmeng
    Acta mathematica scientia,Series B. 2007, 27 (4):  897-907.  DOI: 10.1016/S0252-9602(07)60087-3
    Abstract ( 1141 )   RICH HTML PDF (169KB) ( 1212 )   Save

    In 2000, Wu presented two new types of generalized Ball curves, one of which is called an NB1 curve located between the Wang--Ball curve and the Said--Ball curve. In this article, the authors aim to discuss properties of NB1 curves and surfaces, including the recursive algorithms, conversion algorithms between NB1 and Bezier curves and surfaces, etc. In addition the authors compare the computation efficiency of recursive algorithms for the NB1 and above mentioned two generalized Ball curves and surfaces.

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