共查询到20条相似文献,搜索用时 15 毫秒
1.
《数学物理学报(B辑英文版)》2016,(2)
The geometry of Teichmller metric in an asymptotic Teichmller space is studied in this article. First, a binary infinitesimal form of Teichmller metric on AT(X) is proved.Then, the notion of angles between two geodesic curves in the asymptotic Teichmller space AT(X) is introduced. The existence of such angles is proved and the explicit formula is obtained. As an application, a sufficient condition for non-uniqueness geodesics in AT(X) is obtained. 相似文献
2.
Let M be an approximately finite codimensional quasi-invariant subspace of the Fock space. This paper gives a formula to calculate the codimension of such spaces and uses this formula to study the structure of quasi-invariant subspaces of the Fock space. Especially, as one of applications, it is showed that the analogue of Beurling's theorem is not true for the Fock space L_a~2 in the case of n > 2. 相似文献
3.
WU ZEMIN 《数学年刊B辑(英文版)》2000,(3)
gi. Introductionj is a TeichmUller self-mapping of the unit disk D = {lzl < 1}, if f is a quasiconformalself-mapping of D with a complex dilatation of the formwhere W(z) is holomorphic in D, and k is a constant. Let Q(f) denote the cias$of allquasicochrmal self-mappings of D that aams with j on the boundary OD, f will be calledextremal if IIUlll@ S lip,ll., for mp g E Q(f). Let B(D) depote the class of functionsw(x) holomorphic in D, with the additional restriction 0 < Ilwll ~ 11 Ic(~)… 相似文献
4.
5.
赵俊峰 《数学物理学报(B辑英文版)》1985,(3)
A transfinite basis of the bidual space of the long James space is presented in this paper. Moreover, we prove that the space J(w+r) has the approximation property, where J (ω) is the James space, r is any finite integer. 相似文献
6.
In this article, a new characterization of the closedness of the sum of two closed subspaces of a Hilbert space is established. 相似文献
7.
GAN DANYAN 《数学年刊B辑(英文版)》1994,15(1):123-127
ON THE SHEAF OF GENERALIZED FUNDAMENTAL GROUP AND COVERING SPACE¥GANDANYANAbstract:Theauthorconstructsthesheafofgeneralizedfu... 相似文献
8.
Lin Huaxin 《数学年刊B辑(英文版)》1992,13(4):422-429
Let A be a C~*-algebra and x an element in A. the following invariant subspace problem is considered: Does there exist an irreducible representation π of A such that π(x) has a non-trivial invarint subspace? And a positive solution of the problem for finite separable matroid C~*-algebras is given. Also the eigenvalues Of elements in C~*-algebras is considered. Some versions of Fredholm Alternatives are given. 相似文献
9.
TAOCHANGLI LUSHUJIE LIPENGTONG 《高校应用数学学报(英文版)》1998,13(3):295-300
In this paper, the properties B^n p,q, and B^n 1,q are introduced.A lot of results on the reflexivity of operator operator subspaces which generalize the results in [1] are obtained. 相似文献
10.
FANG Xiaochun 《数学年刊B辑(英文版)》2003,24(1):115-122
Let A be a unital C-algebra, n ∈ N ∪ {∞}. It is proved that the isomorphism △n : is isometric for some suitable distances. Asan application, the author has the split exact sequence with iA contractive (and isometric if n = ∞) under certain condition of A. 相似文献
11.
Zhang Yan Li Cuiping 《Annals of Differential Equations》2006,22(4):602-610
In this paper, we study a class of complete Abelian integral. We give an exact number and the upper bound of the number of zero points of the integral under some conditions. 相似文献
12.
In this paper, the structural properties of the discrete positive real matrix (DPRM) are discussed by means of coprime fraction of a rational function matrix. Some structural properties of the DPRM are the same with the continuous positive real matrix (CPRM), but the other properties are unique with the DPRM. 相似文献
13.
In this paper,some properties of the rational positive real matrix are discussed by means ofcoprime fraction of a rational matrix.Some equivalent conditions which are natural extension of therational positive real function,are given for testing a rational positive real matrix. 相似文献
14.
ON THE STABILITY OF FUSION FRAMES (FRAMES OF SUBSPACES) 总被引:1,自引:0,他引:1
Mohammad Sadegh Asgari 《数学物理学报(B辑英文版)》2011,31(4):1633-1642
A frame is an orthonormal basis-like collection of vectors in a Hilbert space, but need not be a basis or orthonormal. A fusion frame (frame of subspaces) is a frame-like collection of subspaces in a Hilbert space, thereby constructing a frame for the whole space by joining sequences of frames for subspaces. Moreover the notion of fusion frames provide a framework for applications and providing efficient and robust information processing algorithms.In this paper we study the conditions under which removing an element from a fusion frame, again we obtain another fusion frame. We give another proof of [5, Corollary 3.3(iii)] with extra information about the bounds. 相似文献
15.
Y-Riemannian metric gY is an important tool in Finsler geometry, where Y is a smooth non-zero vector field on Finsler manifold. If Y is a geodesic field, it is very effective to study flag curvature using Y-Riemann metric. In this paper, using a special Y-Riemann metric ( that is, so called v-Riemann metric ), we study hyperspheres in a Minkowski space and give some characteristics of hyperspheres in a Minkowski space. 相似文献
16.
任德麟 《数学物理学报(B辑英文版)》1984,(1)
Let P_n, be the n-dimensional projective space. Let x_0,x_1,…,x_n be the homogeneous coordinates of point x. Consider the quadric φ(x) =x_0~2+x_1~2+…x_(n-1)~2+εx_n~2, where ε can take the value of +1 or -1. We assume the homogeneous coordinates of the points x that do not belong to φ = 0 are normalized, such that 相似文献
17.
In this paper,the authors consider the ω-type Calderón-Zygmund operator Tω and the commutator [b,Tω] generated by a symbol function b on the Lorentz space Lp,r(X)over the homogeneous space(X,d,μ).The boundedness and the compactness of the commutator [b,Tω] on Lorentz space Lp,r(X) are founded for any p ∈(1,∞) and r ∈ [1,∞). 相似文献
18.
胡耀忠 《数学物理学报(B辑英文版)》1986,(1)
The concept of tho basic space is introduced in this paper, which contains tho white noise space and tho abstract Wiener space. Many results of stochastic analysis of the stochastic functional on white noiso space ([4]) and abstract Wiener space ([12]) are generalisod into this space, for example, Fourier transformation, Fourier-Wiener transformation and Malliavin's calculus, etc. 相似文献
19.
WANG Zhe 《数学年刊B辑(英文版)》2005,26(4):537-542
The model of the universal Teichmuller space by the derivatives of logarithm is the union of infinite disconnected components. In this paper, it is proved that the distance between different components is 0, and the distance from the center of a component to every other component is 2. 相似文献
20.
Zheng Dayi Lu Xuanzhu 《Annals of Differential Equations》2005,21(3):518-524
In this paper, a space fractional differential equation is considered. The equation is obtained from the parabolic equation containing advection, diffusion and reaction terms by replacing the second order derivative in space by a fractional derivative in space of order. An implicit finite difference approximation for this equation is presented. The stability and convergence of the finite difference approximation are proved. A fractional-order method of lines is also presented. Finally, some numerical results are given. 相似文献