数学学报杂志 北大期刊 CSCD期刊 统计源期刊

Oscillation Theorems for Second-Order Nonlinear Neutral Delay Dynamic Equations on Time Scales

作者：Samir; H.SAKER; Donal; O’REGAN; Ravi; P.AGARWAL 刊期：2008年第09期

<正> By employing the generalized Riccati transformation technique,we will establish some newoscillation criteria and study the asymptotic behavior of the nonoscillatory solutions of the second-ordernonlinear neutral delay dynamic equation[r(t)[y(t)+p(t)y(■(t))]~Δ]~Δ+q(t)f(y((δ(t)))=0on a time scale■.The resu...

Projective Blaschke Manifolds

作者：An; Min; Li; and; Guo; Song; Zhao 刊期：2008年第09期

<正> In this paper we define the concept of projective Blaschke manifolds and extend the theoryof equiaffine differential geometry to the projective Blaschke manifolds.

New Hardy Spaces Associated with Some Anisotropic Herz Spaces and Their Applications

作者：Yong; Ding; Sen; Hua; Lan; Shan; Zhen; Lu 刊期：2008年第09期

<正> In this paper,a class of anisotropic Herz-type Hardy spaces associated with a non-isotropicdilation on■are introduced,and the central atomic and molecular decomposition characterizationsof those spaces are established.As some applications of the decomposition theory,the authors studythe interpolation prob...

On Hyperinvariant Subspaces of Contraction Operators on a Banach Space Whose Spectrum Contains the Unit Circle

作者：Ming; Xue; Liu 刊期：2008年第09期

<正>In this paper, we prove that every operator in a class of contraction operators on a Banach space whose spectrum contains the unit circle has a nontrivial hyperinvariant subspace.

Nonparametric Inference in a Simple Change-point Model

作者：Zhan; Feng; Wang; Yao; Hua; Wu; and; Lin; Cheng; Zhao 刊期：2008年第09期

Limsup Results and LIL for Partial Sum Processes of a Gaussian Random Field

作者：Yong-Kab; CHOI; Mikls; CSRG 刊期：2008年第09期

A Four-filtrated May Spectral Sequence and Its Applications

作者：Xiu; Gui; Liu; and; Xiang; Jun; Wang 刊期：2008年第09期

Blow-up for Doubly Degenerate Nonlinear Parabolic Equations

作者：Ming; Yu; Chen 刊期：2008年第09期

<正> In this paper,we give a complete picture of the blow-up criteria for weak solutions of theDirichlet problem of some doubly degenerate nonlinear parabolic equations.

L~p Approximation Capability of RBF Neural Networks

作者：Dong; Nan; Wei; Wu; Jin; Ling; Long; Yu; Mei; Ma; and; Lin; Jun; Sun 刊期：2008年第09期

Best Simultaneous Approximation to Totally Bounded Sequences in Banach Spaces

作者：Genaro; LOPEZ 刊期：2008年第09期

<正> This paper is concerned with the problem of best weighted simultaneous approximationsto totally bounded sequences in Banaeh spaces.Characterization results from convex sets in Banachspaces are established under the assumotion that the Banach soace is uniformly smooth.

Bi-Lipschitz Maps in Q-regular Loewner Spaces

作者：Ke; Ying; Chen; and; Ai; Nong; Fang 刊期：2008年第09期

<正> By applying the theory of quasiconformal maps in measure metric spaces that was intro-duced by Heinonen Koskela,we characterize bi-Lipschitz maps by modulus inequalities of rings andmaximal,minimal derivatives in Q-regular Loewner spaces.Meanwhile the sufficient and necessaryconditions for quasiconformal m...

Center and Isochronous Center Problems for Quasi Analytic Systems

作者：Yi; Rong; Liu; Ji; Bin; Li 刊期：2008年第09期

<正> This paper considers the problems of determining center or focus and isochronous centersfor the planar quasi-analytic systems.Two recursive formulas to determine the focal values and periodconstants are given.The convergence of first integral near the center is proved.Using the generalresults to quasi-quad...