具有非倍测度的参数型Marcinkiewicz交换子在Morrey空间的有界性

本文证明了由参数型Marcinkiewicz积分M~p和Lipschitz函数b生成的交换子M_b~p的有界性。在M的核函数满足较强的H(o|¨)rmander条件下,证明了M_b~p不仅从Morrey空间M_p~q(μ)到Morrey空间M_t~s(μ)有界,从Morrey空间M_p~q(μ)到Lipschitz空间Lip_(β-n/p)(μ)有界,而且从Morrey空间M_p~q(μ)到RBMO(μ)有界.     

非齐型空间上分数型Marcinkiewicz积分算子的加权估计

令(H,d,μ)为满足所谓上倍双倍条件和几何双倍条件的度量测度空间.设M_(β,ρ,q)为(H,d,μ)上的分数型Marcinkiewicz积分算子.在本文中,作者证明了若β∈[0,∞),ρ∈(0,∞),q∈(1,∞)且M_(β,ρ,q)在L~2 (μ)上有界,则M_(β,ρ,q)是从加权Lebesgue空间L~p(w)到加权弱Lebesgue空间L~(p,∞)(w)上有界和从加权Morrey空间L~(p,κ,η)(ω)到加权弱Morrey空间WL~(p,κ,η)(ω)上有界.     

Marcinkiewicz积分交换子的加权有界性(英文)

本文应用加权Hardy空间H_ω~p(R~n)上的原子分解理论,研究了由函数b∈Λβ(R~n)(0<β≤1)与Marcinkiewicz积分μ_Ω生成的交换子μ_Ω~b的有界性;证明了μ_Ω~b是从L~q(ω~q)到L~q(ω~q)有界的,从L~1(|x|γ(n-β)/n)到弱L(n/n-β)(|x|~γ)有界的,且从H~p(ω~p)到L~q(ω~q)有界的,这里1/p-1/q=β/n.     

非齐型度量测度空间上参数型Marcinkiewicz积分算子的有界性

设(χ,d,μ)是Hytonen意义下的满足上双倍条件和几何双倍条件的度量测度空间,在此背景下,本文引进(χ,d,μ)上的参数型Marcinkiewicz积分算子M~ρ,并在算子M~ρ在某个L~(p_0)(μ)(p_0∈(1,∞))上有界的条件下证明了M~ρ映L~1(μ)到L~(1,∞)(μ)有界,映原子Hardy空间H~1(μ)到L~1(μ)有界以及映L~∞(μ)到正则有界低振荡空间(BLO)RBLO(μ)有界,最后通过插值的方法,建立M~ρ在L~p(μ)上的有界性,其中p∈(1,∞).     

振荡超奇性Hilbert变换的Sobolev有界性

主要研究R~n上沿曲线Γ(t)=(t~(p_1),t~(p_2),…,t~(p_n))的振荡超奇性Hilbert变换H_(n,α,β)=∫_0~1 f(x-Γ(t))e~(it-β)t~(-1-α),在Sobolev空间上的有界性,其中0p_1P_2…P_n,αβ0.证明了对于0γ(nα)/((n+1))(p_1+α),当|1/p-1/2|(β-(n+1)[α-(β+p_1)γ])/(2β)时,H_(n,α,β)是从L_γ~2(R~n))到L~2(R~n)的有界算子.特别地,当β≥(α-γp_1)/(γ+1/(n+1))等时,H_(n,α,β)是从L_γ~2(R~n)到L~2(R~n)的有界算子·     

非齐性测度空间上的Marcinkiewicz积分的交换子的端点估计（英文）

令(X,d,μ)是Hytnen给出的满足几何双倍与上有界双倍的度量测度空间.本文主要目的是去证明Marcinkiewicz积分的交换子从LlogL(μ)到L~(1,∞)(μ)及H_(atb)~(1,∞)(μ)到L~(1,∞)(μ)的有界性.     

非齐型空间中一类满足Hrmander条件的Marcinkiewicz交换子估计

记μ为R~d上的非负Radon测度,且仅满足对固定的C_0>0和n∈(0,d],及所有的x∈R~d和r>0,μ(B(x,r))≤C_0r~n.作者建立了一类核函数满足H(o|¨)rmander条件的Marcinkiewicz积分与Lip_β(μ)(0<β)函数生成的交换子由L~p(μ)到L~q(μ),由L~p(μ)到Lip_(β-n/p)(μ)及L~(n/β)(μ)到RBMO(μ)有界.部分结论对经典Marcink(?)ewicz积分也是新的.     

奇异积分交换子的加权Hardy型估计

T_b表示由加权Lipschitz函数b∈Lip_β(μ)(0β1)与Calderon-Zygmund奇异积分算子T生成的交换子.当μ∈A_1,n/(n+β)p≤1时研究了T_b在经典加权Hardy空间H~p(μ))上的有界性质,在端点p=n/(n+β)处研究了T_b在加权Hardy空间上的弱型估计.     

定向集上B值Mil的收敛性及Riesz分解

本文主要研究定向集上B值mil的收敛性和Riesz分解。在[2]中M.Talagrand证明了:一个L~1有界的B值mil(X_n)_(n∈N)有唯一分解X_n=Y_n+Z_n,其中(Y_n)_(n∈N)为L~1有界鞅,(Z_n)_(n∈N)为mil且‖Z_n‖→0。本文将这一结果推广到定向集上,我们证明了:若(X_t,(?)_t,t∈J)为取值于可分Banach空间的mil,(_t)_(t∈J)满足Vitali条件V~1,则X_t有唯一分解X_t=Y_t+Z_t,其中(Y_t)_(t∈J)为L~1有界鞅,(Z_t)_(t∈J)为mil且。     

球面上的Poisson积分

证明了球面上的Poisson积分算子从Lp(Sn?1)到Lorentz空间Lq,1(B1)(q 1)有界,且从有界Borel测度集M(Sn?1)到Lq,1(B1)(q < nn?1)有界,推广了部分已知的结果.进一步构造了一个反例说明了球面上的Poisson积分算子不一定从M(Sn?1)到L n n?1(B1)有界.     

Estimation of the number of components of finite mixtures of multivariate distributions

An estimator of the number of components of a finite mixture ofk-dimensional distributions is given on the basis of a one-dimensional independent random sample obtained by a transformation of ak-dimensional independent random sample. A consistency of the estimator is shown. Some simulation results are given in a case of finite mixtures of two-dimensional normal distributions.     

Galois Structure of K-Groups of Rings of Integers

N/Kbe a Galois extension of number fields with finite Galois group G.We describe a new approach for constructing invariants of the G-module structure of the K groups of the ring of integers of N in the Grothendieck group of finitely generated projective Z[G]modules. In various cases we can relate these classes, and their function field counterparts, to the root number class of Fröhlich and Cassou-Noguès.     

Eigenvector p-Bases of Rings of Constants of Derivations

Let A be a UFD of characteristic p > 0, let 𝒵 be a set of some eigenvectors of a derivation of A. We prove, under some additional assumptions, a necessary and sufficient condition for 𝒵 to be a p-basis of the minimal ring of constants containing 𝒵. The main preparatory result is the unique decomposition theorem with respect to a factor from a given subalgebra containing A^p.     

有资格限制的指派问题的求解方法

在实际的指派工作中，常会遇到某个人有没有资格去承担某项工作的问题，因此，本建立了有资格限制的指派问题的数学模型。在此数学模型中，将效益矩阵转化为判定矩阵，由此给出了判定此种指派问题是否有解的方法；在有解的情况下，进一步将效益矩阵转化为求解矩阵，从而将有资格限制的指派问题化为传统的指派问题来求解。最后给出了一个数值例子来说明这样的处理方法是有效的。     

L－fuzzy集网的R－收敛性质

本文在ＬＦ拓扑空间中建立了Ｌ－ｆｕｚｚｙ集网的弱收敛（Ｒ－收敛）概念，应用文［４］中的Ｒ－闭包，系统讨论了它们的性质，证明了等式ＲｌｉｍＡ＿ｎ＝∧（∨Ａ＿ｍ）＿Ｒ和ＲｌｉｍＡ＿ｎ＝Ａ＿ｎ＝∧（∨Ａ＿ｍ）＿Ｒ并且给出了Ｌ－ｆｕｚｚｙ集网与其子网之间的关系。     

On Sums of Coefficients of Products of Polynomials

We study the nilpotency of the sums of all coefficients of some sorts of products of polynomials over reversible, IFP, and NI rings, and introduce an SCN ring as a generalization. We characterize SCN rings in relation with related ring properties, and also provide several useful properties and ring extensions of SCN rings.     

Convergence of sequences of sets of associated primes

It is a well-known result of M. Brodmann that if is an ideal of a commutative Noetherian ring , then the set of associated primes of the -th power of is constant for all large . This paper is concerned with the following question: given a prime ideal of which is known to be in for all large integers , can one identify a term of the sequence beyond which will subsequently be an ever-present? This paper presents some results about convergence of sequences of sets of associated primes of graded components of finitely generated graded modules over a standard positively graded commutative Noetherian ring; those results are then applied to the above question.

     

两种图多项式根的重数的一个注记

设P1，P2，……，Pt是几乎覆盖图G的l条不相交的路，s是没有被这些路覆盖的孤立点数．本证明：(i)匹配多项式μ(G，x)的非零根的重数最多是l，零根的重数最多l s。（ii)对于不含三角形的n阶图G，伴随多项式h(G，x)的非零根的重数最多是l，零根的重数最多是1/2(n l s)．(iii)对一种含三角形的所谓A型图，（ii）也成立．     

任意矩阵的特征值的扰动估计

设A和B是两个任意的n阶方阵,其特征值分别为{λ_1,…,λ_n}和{μ_1,…,μ_n}.本文对此两组特征值的如下“距离”的界给出了若干估计: B对于A的谱改变量 A与B的特征值的改变量这里的结果包含了Bauer-Fike定理,并且优于Kahan-Parlett/Jiang定理及Chu,施和肖所得出的结果.     

Rates of Convergence of Means of Euclidean Functionals

Let L be the Euclidean functional with p-th power-weighted edges. Examples include the sum of the p-th power-weighted lengths of the edges in minimal spanning trees, traveling salesman tours, and minimal matchings. Motivated by the works of Steele, Redmond and Yukich (Ann. Appl. Probab. 4, 1057–1073, 1994, Stoch. Process. Appl. 61, 289–304, 1996) have shown that for n i.i.d. sample points {X ₁,…,X _n } from [0,1] ^d , L({X ₁,…,X _n })/n ^(d−p)/d converges a.s. to a finite constant. Here we bound the rate of convergence of EL({X ₁,…,X _n })/n ^(d−p)/d . Y. Koo supported by the BK21 project of the Department of Mathematics, Sungkyunkwan University. S. Lee supported by the BK21 project of the Department of Mathematics, Yonsei University.