赋范线性空间中最小时间函数的ε-次微分

在赋范线性空间中,本文讨论最小时间函数T_S的ε-次微分计算公式.T_S由非空闭集S和非空闭凸集U决定,并以距离函数和指示函数为其特例.本文利用新的讨论方法取消了已有结果中的重要假设:T_S满足calmness条件,建立了T_S在集合S外的点处的ε-次微分的下估计式,该估计式由相应的法锥和集合U的支撑函数的次水平集表示.     

赋范线性空间中动态目标集的最大时间函数的Fréchet次微分

本文考虑赋范线性空间中动态目标集的最大时间函数.该函数由动态的目标集和非空仿射控制集决定,以最远距离函数为其特例.本文建立了动态目标集的最大时间函数的Frechet次微分的上下估计式,该估计式由相应的法锥和控制集的支撑函数表示.     

Zalcman引理在随机迭代函数族动力系统中的应用

本文根据Schwick的思想，利用Zalcman引理讨论了随机迭代函数族动力系统，指出了函数族随机迭代动力系统的Fatou集和函数族衍生半群动力系统的Fatou集定义差别明显但却等价.并获得了如下正规定则，设F={f_i|f_i为C（C）上的非线性解析函数，i ∈ M}，其中M为非空指标集，Σ_M={（j₁，j₂，…，j_n，…）|j_i ∈ M，i ∈ N}，若对任意的指标序列σ=（j₁，j₂，…，j_n，…）∈ Σ_M，迭代序列{W_σⁿ=f_jn º f_jn-1 º … ºf_j1（z）|n ∈ N}在点z处正规，则函数族F本身在点z处正规.     

自守L-函数集合的零点密度的整体上界估计

本文通过L-函数的整体积分幂矩,来推导某些自守L-函数集合的整体零点密度的上界估计.具体而言,假设I是某些自守表示π构成的集合,对任意π有非负系数c(π)且级数∑_π∈I c(π)收敛.假设■其中l≥1,0 <α≤1,θ≥α.则可以得到整体零点密度■的上界估计,这里N_π(σ,T₁,T₂)表示满足σ<β<1及T₁≤γ≤T₂的L(s,π)的零点ρ=β+iγ的个数.     

DICR函数的刻画及其在优化问题中的应用

在拓扑向量空间中研究DICR函数.引入该函数关于支撑集、次微分的概念,研究该函数支撑集、次微分之间的关系.也研究了与严格DICR函数相关的集合的最大元,得到严格DICR函数差的全局最小值的充要条件.     

Nevanlinna不等式的余项

给出Nevanlinna不等式的余项S(r,{aj},f)的一个上界估计 .对于给定的满足∫∞1dr/p(r) =∫∞1dr/(r(r) ) =∞的正的增函数p和 ,令 Ψ(r) =∫r1dt/(t(t) ) ,P(r) =∫r1dt/p(t) ,证明了 S(r,{aj},f) ≤logT(r,f)(T(r,f) )p(r) +O( 1 )对扩充复平面上的任意有穷个点 {εj}和满足 Ψ(T(r,f) ) =O(P(r) )的任意亚纯函数f成立 ,至多除去一个r的小例外集 .这个估计改进了已有的结果 .讨论了这个估计的精确性 .     

非可微二层凸规划的最优性条件

本文考虑的是构成函数为非可微凸函数的二层规划问题(NDBP),得到了下层极值函数和上层复合目标函数的方向导数和次微分的估计式,给出非可微二层凸规划(NDBP)最优解的几种最优性条件。     

集合套的落影函数

在Fuzzy集的研究中,罗承忠教授的集合套理论起了重要的作用,它刻划了Fuzzy集和集合套类之间的一一对应关系。本文用汪培庄教授的落影理论讨论集合套的落影,建立了集合套类的落影与Fuzzy集的一一对应关糸,并用实数空间上的概率分布函数表示了集合套的落影函数和任意Fuzzy集的隶属函数。最后还用集合套证明了集值统计对Fuzzy集隶属度估计的可行性。     

半群作用的稠密小周期集系统与完全传递系统（英文）

称一个动力系统(S,X)具有稠密g-小周期集,如果对任意非空开集UX,存在非空闭子集YU和S的一个g-syndetic子半群T,使得TYY;称一个传递的动力系统(S,X)是g-完全传递的,如果对S的每一个g-syndetic子半群T,(T,X)都是传递的.本文指出,每一个具有稠密g-小周期集的g-完全传递系统(S,X)不交于任何极小系统,其中S是一个可数交换半群,S最多只有可数个g-syndetic子半群且S中的每一个元S都为X到自身的满射.     

非可微分二层Lipschitz规划的广义微分和广义方向导数

本文对构成函数为Ｌｉｐｓｃｈｉｔｚ函数的二层规划问题,利用非光滑分析工具,讨论了下层极值函数和上层复合目标函数的Ｌｉｐｓｃｈｉｔｚ连续性,给出了这些函数的广义微分和广义方向导数的估计式。本文得到的结果为进一步研究非可微二层Ｌｉｐｓｃｈｉｔｚ规划的最优性条件和有效算法等理论和方法问题奠定了基础。     

A Bishop–Phelps–Bollobás Theorem for Asplund Operators

By characterizing Asplund operators through Fréchet differentiability property of convex functions, we show the following Bishop–Phelps–Bollobás theorem: Suppose that X is a Banach space,T : X → C(K) is an Asplund operator with ║T║= 1, and that x_0 ∈ S_X, 0 ε satisfy ║T(x_0)║ 1-ε~2/2.Then there exist x_ε∈ S_X and an Asplund operator S : X → C(K) of norm one so that ║S(x_ε)║ = 1, x_0-x_ε ε and ║T-S║ ε.Making use of this theorem, we further show a dual version of Bishop–Phelps–Bollobás property for a strong Radon–Nikodym operator T : ?_1 → Y of norm one: Suppose that y_0~*∈ S_(Y~*), ε≥ 0 satisfy T~*(y_0~*) 1-ε~2/2. Then there exist y_ε~*∈ S_(Y~*), x_ε∈(±e_n), y_ε∈ S_Y, and a strong Radon–Nikodym operator S : ?_1 → Y of norm one so that (ⅰ)║S(x_ε)║= 1;(ⅱ) S(x_ε) = y_ε;(ⅲ)║T-S║ ε;(ⅳ)║S~*(y_ε~*)║=y_ε~*, y_ε= 1;(ⅴ)║y_0~*-y_ε~*║ ε and (ⅵ)║T~*-S~*║ ε,where(e_n) denotes the standard unit vector basis of ?_1.     

The fractional metric dimension of permutation graphs

Let G =(V(G), E(G)) be a graph with vertex set V(G) and edge set E(G). For two distinct vertices x and y of a graph G, let RG{x, y} denote the set of vertices z such that the distance from x to z is not equa l to the distance from y to z in G. For a function g defined on V(G) and for U■V(G), let g(U) =∑s∈Ug(s). A real-valued function g : V(G) → [0, 1] is a resolving function of G if g(RG{x, y}) ≥ 1 for any two distinct vertices x, y ∈ V(G). The fractional metric dimension dimf(G)of a graph G is min{g(V(G)) : g is a resolving function of G}. Let G1 and G2 be disjoint copies of a graph G, and let σ : V(G1) → V(G2) be a bijection. Then, a permutation graph Gσ =(V, E) has the vertex set V = V(G1) ∪ V(G2) and the edge set E = E(G1) ∪ E(G2) ∪ {uv | v = σ(u)}. First,we determine dimf(T) for any tree T. We show that 1 dimf(Gσ) ≤1/2(|V(G)| + |S(G)|) for any connected graph G of order at least 3, where S(G) denotes the set of support vertices of G. We also show that, for any ε 0, there exists a permutation graph Gσ such that dimf(Gσ)- 1 ε. We give examples showing that neither is there a function h1 such that dimf(G) h1(dimf(Gσ)) for all pairs(G, σ), nor is there a function h2 such that h2(dimf(G)) dimf(Gσ) for all pairs(G, σ). Furthermore,we investigate dimf(Gσ) when G is a complete k-partite graph or a cycle.     

相依误差广义线性模型的M估计的Bahadur表示

考虑如下广义线性模型y_i=h(x~T_i,β)+e_i=1,2,…,n,其中e_i=G(…,ε_(i-1),ε_i),h是一个连续可导函数,ε_i是独立同分布的随机变量,并且它的期望为0,方差σ~2有限.本文给出了参数β的M估计,并且得到了该估计的Bahadur表示,该结论推广了线性模型的相关结论.应用M估计的Bahadur表示,得到了相依误差的线性回归模型,poisson模型,logistic模型和独立误差的广义线性模型等模型的渐近性质.     

Subdifferential properties for a class of minimal time functions with moving target sets in normed spaces

In a normed vector space, we study the minimal time function determined by a moving target set and a differential inclusion, where the set-valued mapping involved has constant values of a bounded closed convex set U. After establishing a characterization of ?-subdifferential of the minimal time function, we obtain that the limiting subdifferential of the minimal time function is representable by virtue of the corresponding normal cones of sublevel sets of the function and level or sublevel sets of the support function of U. The known results require the set U to have the origin as an interior point and the target set is a fixed set.     

Parameter Estimation for the Discretely Observed Vasicek Model with Small Fractional Lévy Noise

The statistical inference of the Vasicek model driven by small Levy process has a long history.In this paper,we consider the problem of parameter estimation for Vasicek model dX_t=(μ-θX_t)dt+εdL_t^d,t∈[0,1],X_0=x_0,driven by small fractional Lévy noise with the known parameter d less than one half,based on discrete high-frequency observations at regularly spaced time points{t_i=i/n,i=1,2,...,n}.For the general case and the null recurrent case,the consistency as well as the asymptotic behavior of least squares estimation of unknown parametersμandθhave been established as small dispersion coefficientε→0 and large sample size n→∞simultaneously.     

Bounded Fatou components of transcendental entire functions with order less than 1/2

Let f be a transcendental entire function with order ρ 12and let σ be a sufficiently large constant. We prove that if there exists r0 1 such that, for all r r0 and any small ε 0,M(rσ, f) ≥ M(r, f)σ+ε,then every component of the Fatou set F(f) is bounded.     

Comparison and Extremal Results on Three Eccentricity-based Invariants of Graphs

The first and second Zagreb eccentricity indices of graph G are defined as:E1(G)=∑(vi)∈V(G)εG(vi)~2,E2(G)=∑(vivj)∈E(G)εG(vi)εG(vj)whereεG(vi)denotes the eccentricity of vertex vi in G.The eccentric complexity C(ec)(G)of G is the number of different eccentricities of vertices in G.In this paper we present some results on the comparison between E1(G)/n and E2(G)/m for any connected graphs G of order n with m edges,including general graphs and the graphs with given C(ec).Moreover,a Nordhaus-Gaddum type result C(ec)(G)+C(ec)(■)is determined with extremal graphs at which the upper and lower bounds are attained respectively.     

Subdifferential of the closed convex hull of a function and integration with nonconvex data in general normed spaces

In this paper we approach the study of the subdifferential of the closed convex hull of a function and the related integration problem without the usual assumption of epi-pointedness. The key tool is, as in Hiriart-Urruty et al. (2011) [7], the concept of ε-subdifferential. Some other assumptions which are standard in the literature are also removed.     

Exact characterization for subdifferentials of a special optimal value function

For a closed set S and a bounded closed convex set U in a real normed vector space, we give exact subdifferential formulas of an optimal value function \(\mathrm {I}\!\Gamma _{S|U}\) whose definition is based on the Minkowski function of U. \(\mathrm {I}\!\Gamma _{S|U}\) covers distance function and indicator function as special cases. The main contribution is dropping two important assumptions of some main results in the literature.     

极分解定理的注记

设H和K是Hilbert空间.首先,对给定的算子T∈B（H,K）,刻画了集合U_T={U∈B（H,K）：U是部分等距算子并且T=U（T^*T）^1/2}. 其次,对部分等距算子U∈B（H,K）,还给出集合T_U={T∈B（H,K）：N（T）=N（U）,R（T）=R（U）,T=U（T^*T）^1/2}的刻画. 最后,作为主要结果的应用得到了相关结论.