实Grassmann流形上的道路空间

Ｇ（ｎ，ｍ）表示Ｒ￣ｎ＋ｍ中全体ｎ维子空间所构成的实Ｇｒａｓｓｍａｎｎ流形。本文首先找到ｐ，ｑ∈Ｇ（ｎ，ｍ）沿任何测地线均不共轭的充要条件，因此连接这样两点的测地线有可数条。通过计算得到编号为（ｋ＿１，ｋ＿２，…，ｋ＿ｎ）的测地线指标λ（ｋ＿１，ｋ＿２…，ｋ＿ｎ）．最后根据Ｍｏｒｓｅ基本定理得到：设ｐ，ｑ是Ｇ（ｎ，ｍ），上沿任何测地线均不共轭的两点，则连接ｐ，ｑ的分段光滑道路空间同伦于一可数ＣＷ－复形，该复形中的胞腔可编号为（ｋ＿１，ｋ＿２，…，ｋ＿ｎ），ｋ＿ｉ为整数，且编号为（ｋ＿１，ｋ＿２，…，ｋ＿ｎ的胞腔的维数为λ（ｋ＿１，ｋ＿２…，ｋ＿ｎ）。     

On (4p~2q~(2b),2p~2q~(2b)-pq~b,p~2q~(2b)-pq~b) Menon Difference Sets

Ｏｎ（４ｐ２ｑ２ｂ，２ｐ２ｑ２ｂ－ｐｑｂ，ｐ２ｑ２ｂ－ｐｑｂ）ＭｅｎｏｎＤｉｆｅｒｅｎｃｅＳｅｔｓＷａｎＺｈａｏｚｅ（万兆泽）（ＣｏｌｅｇｅｏｆＭａｔｈｅｍａｔｉｃＳｃｉｅｎｃｅ，ＰｅｋｉｎｇＵｎｉｖｅｒｓｉｔｙ，Ｂｅｉｊｉｎｇ，１００８７１）Ａｂｓ...     

关于多项式的Waring问题（Ⅱ）

设ｆ＿ｌ（ｘ）是首项系数为正的ｌ次整系数多项式，满足条件：不存在整数ｄ，ｑ＞１使得ｆ＿ｌ（ｘ）≡ｄ（ｍｏｄｑ）对所有ｘ成立．记Ｒ＿ｋ（ｎ）为方程的正整数的解数，本文的主要结果是：对于及充分大的ｎ，我们有Ｒ＿ｋ（ｎ）》这是Ｖａｕｇｈａｎ关于Ｗａｒｉｎｇ问题的一个结果对多项式的推广。     

Jacobi多项式零点为结点的Lagrange插值多项式之逼近

对于可微函数ｆ∈Ｃｑ［－１，１］，本文研究以Ｊａｃｏｂｉ多项式Ｊ（α，β）ｎ（ｘ）的零点为结点组之Ｌａｇｒａｎｇｅ插值多项式对ｆ及其导数的同时逼近，证明不等式Ｌ（ｓ）ｎ（ｆ，α，β，ｘ）－ｆ（ｓ）（ｘ）＝Ｏ（１）Δ－ｓｎ（ｘ）Δｑｎ（ｘ）ω（ｆ（ｑ），Δｎ（ｘ））ｌｏｇｎ｛＋（１－ｘ＋ｎ－１）－α－１２ｎ－ｑω（ｆ（ｑ），ｎ－１）｝，在［０，１］上对于ｓ＝０，１，２，…，ｑ一致成立，其中Δｎ（ｘ）＝ｎ－１１－ｘ２＋ｎ－２     

Hilbert模形式与一类Dirichlet级数的特殊值

在文［２］中，Ｗ．Ｋｏｈｎｎ对权为ｋ和ｌ的任意二个歧点型模形式ｆ和ｇ（其变换群是全模群ＳＬ＿２（Ｚ））定义了一类Ｄｉｒｉｃｈｌｅｔ级数Ｌ＿（ｆ，ｇ，ｎ）（ｓ），利用Ｌ＿（ｆ，ｇ；ｎ）（ｓ）（为整数），可构造一个线性映射Ｗ＿ｇ：Ｓ＿ｋ→Ｓ＿（ｋ－ｌ）．并且讨论了Ｌ＿（ｆ，ｇ；ｎ）的一些特征值．在本文中，我们将［２］中的结果推广到Ｈｉｌｂｅｒｔ模形式的情况，并得到类似的结论．     

P_（q－1）的补图的色唯一性

用Ｐ＿ｎ表示有ｎ个顶点的路。本文证明了，如果ｑ＞５是素数，则Ｐ＿（ｑ－１）的补图是色唯一的。     

Ck（X）的扇密度和强Frechet性质

本文证明了如下两个定理：（１）Ｃ＿ｋ（Ｘ）为强Ｆｒｅｃｈｅｔ空间（或者Ｆｒｅｃｈｅｔ空间）的充分必要条件是Ｘ中的每一开Ｋ－覆盖序列｛ｕ＿ｎ：ｎ∈Ｎ｝，存在Ｕ＿ｎ∈ｕ＿ｎ，使｛Ｕ＿ｎ：ｎ∈Ｎ｝为Ｘ的Ｋ－序列，（２）Ｃ＿ｋ（Ｘ）有可数扇密度的充分必要条件是Ｘ中的每一开Ｋ－覆盖序列｛ｕ＿ｎ：ｎ∈Ｎ｝存在ｕ＿ｎ的有限于族ｕ＇＿ｎ，使｛ｕ＇＿ｎ：ｎ∈Ｎ｝是Ｘ的开Ｋ－覆盖．     

正交设计的最新发展和应用(Ⅱ)—均匀正交设计

方开泰等．正交设计的最新发展和应用（Ⅱ）—均匀正交设计．令Ｌ（ｎ;ｑｓ）为一切正交表Ｌｎ（ｑｓ）之集合,Ｍ为试验点分布于试验区域的均匀性测度。给定（ｎ,ｑ,ｓ）,在Ｌ（ｎ;ｑｓ）上具有最好均匀性（在测度ＭＦ）的设计称为无匀正交设计,并表为ＵＬｎ（ｑｓ）。本讲座以ＵＬ９（３４）为例说明均匀正交设计在估计和混杂方面的优良性质。在附录中列出了七个均匀正交表,它们都是最近获得的     

正交设计的最新发展和应用(Ⅱ)-均匀正交设计

方开泰等．正交设计的最新发展和应用（Ⅱ）—均匀正交设计．令Ｌ（ｎ;ｑｓ）为一切正交表Ｌｎ（ｑｓ）之集合,Ｍ为试验点分布于试验区域的均匀性测度。给定（ｎ,ｑ,ｓ）,在Ｌ（ｎ;ｑｓ）上具有最好均匀性（在测度ＭＦ）的设计称为无匀正交设计,并表为ＵＬｎ（ｑｓ）。本讲座以ＵＬ９（３４）为例说明均匀正交设计在估计和混杂方面的优良性质。在附录中列出了七个均匀正交表,它们都是最近获得的     

量子代数Uq（C_2）的有限维不可约表示

本文分析了量子代数Ｕｑ（Ｃａ）生成元的对易关系，构造了的秩张量，利用量子代数的张性性质，方便地求出了Ｕｑ（Ｃａ）的有限维不可约表示，部分低维不可的表示被列于表中．     

U_q(sl_2,C)单位根时的中心以及非负部分的刻画

定义了sl_2一种新的量子代数U_q(sl_2,C),它是U_q(sl_2)的推广.设(U_q(sl_2,C))^(≥0)是U_q(sl_2,C)的非负部分,刻画了(U_q(sl_2,C))(≥0)是U_q(sl_2,C)的非负部分,刻画了(U_q(sl_2,C))^(≥0)的中心,(U_q(sl_2,C))(≥0)的中心,(U_q(sl_2,C))^(≥0)上的所有有限维不可约表示以及单位根时U_q(sl_2,C)的中心.     

量子群U_q(f(K))的局部有限子代数的稳定理想

利用量子群U=U_q(f(K))的表示理论及其局部有限子代数F(U)的子模结构,证明了U_q(f(K))的局部有限子代数F(U)的任一非零理想均可由若干个具有不同权的最高权向量的和生成.     

Symmetric Hermitian decomposability criterion,decomposition, and its applications

The Hermitian tensor is an extension of Hermitian matrices and plays an important role in quantum information research. It is known that every symmetric tensor has a symmetric CP-decomposition. However, symmetric Hermitian tensor is not the case. In this paper, we obtain a necessary and sufficient condition for symmetric Hermitian decomposability of symmetric Hermitian tensors. When a symmetric Hermitian decomposable tensor space is regarded as a linear space over the real number field, we also obtain its dimension formula and basis. Moreover, if the tensor is symmetric Hermitian decomposable, then the symmetric Hermitian decomposition can be obtained by using the symmetric Hermitian basis. In the application of quantum information, the symmetric Hermitian decomposability condition can be used to determine the symmetry separability of symmetric quantum mixed states.     

The quantum general linear supergroup,canonical bases and Kazhdan-Lusztig polynomials

Canonical bases of the tensor powers of the natural -module V are constructed by adapting the work of Frenkel, Khovanov and Kirrilov to the quantum supergroup setting. This result is generalized in several directions. We first construct the canonical bases of the ℤ₂-graded symmetric algebra of V and tensor powers of this superalgebra; then construct canonical bases for the superalgebra O _q (M _m|n ) of a quantum (m,n) × (m,n)-supermatrix; and finally deduce from the latter result the canonical basis of every irreducible tensor module for by applying a quantum analogue of the Borel-Weil construction. This work was supported by National Natural Science Foundation of China (Grant No. 10471070)     

What Is a Quantum Stochastic Differential Equation from the Point of View of Functional Analysis?

We prove that a quantum stochastic differential equation is the interaction representation of the Cauchy problem for the Schrödinger equation with Hamiltonian given by a certain operator restricted by a boundary condition. If the deficiency index of the boundary-value problem is trivial, then the corresponding quantum stochastic differential equation has a unique unitary solution. Therefore, by the deficiency index of a quantum stochastic differential equation we mean the deficiency index of the related symmetric boundary-value problem.In this paper, conditions sufficient for the essential self-adjointness of the symmetric boundary-value problem are obtained. These conditions are closely related to nonexplosion conditions for the pair of master Markov equations that we canonically assign to the quantum stochastic differential equation.     

Quantum Fourier transform revisited

The fast Fourier transform (FFT) is one of the most successful numerical algorithms of the 20th century and has found numerous applications in many branches of computational science and engineering. The FFT algorithm can be derived from a particular matrix decomposition of the discrete Fourier transform (DFT) matrix. In this paper, we show that the quantum Fourier transform (QFT) can be derived by further decomposing the diagonal factors of the FFT matrix decomposition into products of matrices with Kronecker product structure. We analyze the implication of this Kronecker product structure on the discrete Fourier transform of rank‐1 tensors on a classical computer. We also explain why such a structure can take advantage of an important quantum computer feature that enables the QFT algorithm to attain an exponential speedup on a quantum computer over the FFT algorithm on a classical computer. Further, the connection between the matrix decomposition of the DFT matrix and a quantum circuit is made. We also discuss a natural extension of a radix‐2 QFT decomposition to a radix‐d QFT decomposition. No prior knowledge of quantum computing is required to understand what is presented in this paper. Yet, we believe this paper may help readers to gain some rudimentary understanding of the nature of quantum computing from a matrix computation point of view.     

量子代数模的张量积与不可分解模

令M是Z[v]的由v-1和奇素数p生成的理想,U是A=Z[v]M上相伴于对称Cartan矩阵的量子代数.k是特征为零的代数闭域,A→k(v(?)ξ)是环同态.U_k=U(?)_Ak,u_k是U_k的无穷小量子代数.令ξ是1的p次本原根.本文证明了:若有限维可积U_k模M,V中至少有一个是内射模,或者M,V中有一个模作为u_k模是平凡的,则有U_k模同构M(?)V≌V(?)M.我们还证明了:若有限维可积U_k模V作为u_k模是不可分解的,有限维可积U_k模M是不可分解的,且M|_(uk)是平凡的,则V(?)M是不可分解U_k模.令V和M是有限维可积U_k模,作为u_k模是同构的且具有单基座,本文证明V和M作为U_k模也是同构的.由此得到:不可分解内射u_k模提升为U_k模是唯一的.     

Hopf algebras of types which give rise to certain invariants of knots, links and 3-manifolds

In this paper we determine when Lusztig's has all the desired properties necessary to define invariants of knots, links and 3-manifolds. Specifically, we determine when it is ribbon, unimodular and factorizable. We also compute the integrals and distinguished elements involved.

     

Connected components of compact matrix quantum groups and finiteness conditions

We introduce the notion of identity component of a compact quantum group and that of total disconnectedness. As a drawback of the generalized Burnside problem, we note that totally disconnected compact matrix quantum groups may fail to be profinite. We consider the problem of constructing the identity component by introducing canonical approximating transfinite sequences of subgroups. These sequences have lengths ≤1 in the classical case but can be countably infinite for duals of discrete groups. We give examples of free product quantum groups where the identity component is not normal and the associated sequence has length 1.     

The quantum stochastic equation is unitarily equivalent to a symmetric boundary value problem for the Schrödinger equation

We prove that the solution of the Hudson-Parthasarathy quantum stochastic differential equation in the Fock space coincides with the solution of a symmetric boundary value problem for the Schrödinger equation in the interaction representation generated by the energy operator of the environment. The boundary conditions describe the jumps in the phase and the amplitude of the Fourier transforms of the Fock vector components as any of its arguments changes the sign. The corresponding Markov evolution equation (the Lindblad equation or the “master equation”) is derived from the boundary value problem for the Schrödinger equation.