锥Pf的若干性质

利用实赋范线性空间E上非零连续线性泛函f,确定了E上半序关系和锥Pf,证明了锥Pf的几个性质,给出了H ilbert空间中Pf的对偶锥的表现形式及由Pf确定的H ilbert投影距离与T hom pson距离.     

正定Hermitian锥上的Siegel-Godement变换

<正> 古典的Laplace变换的特例是T函数:这里 t~(-1)dt 是一维实锥 R~+={t>0}上在运动群 t→at 下的不变体积元素.г函数及Laplace 变换推广到更一般的空间上已有许多工作.其中最有影响的是1938年 Siegel 将其推广到正定实对称矩阵锥 V={T>0}T 是实对称矩阵}而得到的以下公式([2]):     

Haagerup性质的谱刻画（英文）

设G是一个作用在集合X上的一个幺模局部紧群,并且带有一个不可约但可逆的随机游动μ,本文利用全局Laplace算子△_μ的某些谱性质给出了群G有Haagerup性质的充分必要条件和群对(G,H)有相对性质T的充分必要条件.若群Γ是由有限集S生成的,本文用局部Laplace算子△_μ_S的数值域给出了群Γ有Haagerup性质的等价条件.     

关于动力系统(du)/(dt)=F(u)的锥性质的几点注记

本文对［１］中动力系统(du)/(dt)=F(u)的锥性质定理提出几点注记，说明定理中的锥H_γ与通常锥的异同．     

圆模式的Andreev-Thurston定理的能量函数方法证明

对于一个给定边界标号的加权三角剖分(T,θ)(θ∈[0,π/2]),通过构造(T,θ)的内部顶点上的能量函数,推出对应于内部顶点的标号向量是由它的锥向量唯一决定的.导出一个向量是锥向量当且仅当它满足锥向量不等式.通过证明所要求的圆模式决定的相关(T,θ)所有内部顶点的角总和向量满足锥向量不等式,得到在复平面上实现该加权三角剖分(T,θ)的平面单叶圆模式和有分枝圆模式的存在性和唯一性.这为圆模式的存在唯一性定理提供了一种新的证明方法.     

格群的T—Fuzzy子格群

引入格群L关于t-norm T的Fuzzy子格群、Fuzzy正则子格群（简称T-Fuzzy子格群、T-Fuzzy正规子格群）等概念,研究它们的性质,给出T-Fuzzy子格群的刻画。     

基于T2ITrFHA算子与T2ITrFHG算子联合的多准则群决策方法

在二型直觉模糊集与直觉梯形模糊数的基础上,定义二型直觉梯形模糊数及其运算规则,证明了该运算规则的相关性质.由此定义二型直觉梯形模糊数的几类集结算子,讨论了这些算子的性质,将二型直觉梯形模糊混合算术平均(T2IT:。FHA)算子与二型直觉梯形模糊混合几何(r】?2Y11rFHG)算子应用于群决策中,提出基于T2InFHA算子与T2I,nFHG算子联合的多准则群决策方法.最后,算例表明文章所提方法的有效性及合理性.     

关于不动点集的余维数为7的带有对合的流形

<正> M~n是一个带有光滑对合(involution)T的n维闭流形,F为T的不动点集.[5]中讨论了不动点集是(n-k)维的情形.J_n~k是(未定向的上协边群)内具有上述性质的代     

几类非对称可递域

本文从探讨与矩阵群有紧密关系的几类仿射齐性锥入手,进而给出几类称之为群锥的仿射齐性锥并以这些锥为底造出几类非对称仿射可递的Siegel域,其结果包括了[2]中列举的几类非对称域。     

有限群的弱S-拟正规嵌入子群

群G的子群H称为在G中S-拟正规嵌入的,如果对于任意的素数p| |H|,H的Sylow p-子群也是G的某个S-拟正规子群的Sylow P-子群.称群G的子群H在G中弱S-拟正规嵌入,如果存在群G的正规子群T,使得HT(△)-G且H∩T在G中是S-拟正规嵌入的.研究了弱S-拟正规嵌入子群的性质,给出了某些群类的新的特征,并推广了一些已知的结论.     

Coarse Equivalences Between Warped Cones

Warped cones were introduced by J. Roe in Geometry Topol. 9 (2005) 163–178 where he discussed Property A of these spaces. In this paper, we discuss the coarse equivalence of warped cones on the circle with the -action by irrational rotations. First, we prove that two irrational numbers related by PSL(2, ) give coarsely equivalent warped cones. Second, we prove that there are at least countably many warped cones that are not coarsely equivalent to each other by using a ‘secondary growth function’.     

On the Uniform Nonsingularity Property for Linear Transformations on Euclidean Jordan Algebras

In a recent paper, Chua and Yi introduced the so-called uniform nonsingularity property for a nonlinear transformation on a Euclidean Jordan algebra and showed that it implies the global uniqueness property in the context of symmetric cone complementarity problems. In a related paper, Chua, Lin, and Yi raise the question of converse. In this paper, we show that, for linear transformations, the uniform nonsingularity property is inherited by principal subtransformations and, on simple algebras, it is invariant under the action of cone automorphisms. Based on these results, we answer the question of Chua, Lin, and Yi in the negative.     

Warped MPDAE Models including Minimisation Criteria for the Simulation of RF Signals

In radio frequency (RF) applications, electric circuits produce signals including widely separated time scales. A multidimensional representation yields an efficient model by decoupling the time scales. Consequently, a warped multirate partial differential algebraic equation (MPDAE) describes the circuit's behaviour. The appropriate determination of an arising local frequency function is crucial for the efficiency of this approach. Variational calculus implies a necessary condition to a specific solution, which exhibits a minimal amount of oscillations in the whole domain of dependence. We apply a similar strategy to minimise oscillatory performance in some boundary values only. Now variational calculus yields a boundary condition, which can easily be used in numerical methods. We compare the results of both minimisation criteria in a simulation of a warped MPDAE model. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)     

Geodesics in the Space of Kähler Cone Metrics II: Uniqueness of Constant Scalar Curvature Kähler Cone Metrics

In this article, we give a complete construction of geodesics in the space of Kähler cone metrics (cone geodesics), and we address the problem on the uniqueness of constant scalar curvature Kähler (cscK) cone metrics when the cone angle β stays in the whole interval (0, 1] . The part requires new weighted function spaces and new analytic techniques. We determine the asymptotic behavior of both cone geodesics and cscK cone metrics, prove the reductivity of the automorphism group, and establish the linear theory for the Lichnerowicz operator, which immediately implies the openness of the path deforming the cone angles of cscK cone metrics. © 2019 Wiley Periodicals, Inc.     

Generalized linear complementarity problems

It has been shown by Lemke that if a matrix is copositive plus on ⁿ , then feasibility of the corresponding linear complementarity problem implies solvability. In this article we show, under suitable conditions, that feasibility of ageneralized linear complementarity problem (i.e., defined over a more general closed convex cone in a real Hilbert space) implies solvability whenever the operator is copositive plus on that cone. We show that among all closed convex cones in a finite dimensional real Hilbert Space, polyhedral cones are theonly ones with the property that every copositive plus, feasible GLCP is solvable. We also prove a perturbation result for generalized linear complementarity problems.This research has been partially supported by the Air Force Office of Scientific Research under grants #AFOSR-82-0271 and #AFOSR-87-0350.     

Recurrence and Almost Periodicity in Transformation Groups

In [5] Gottschalk comments that an interesting question is to find conditions under which pointwise recurrence in a transformation group (X,T) implies pointwise almost periodicity. In this paper we show that if in a transformation group (X,T), the phase space X is connected locally compact and Hausdorff and T is generative and each point xεX is of P-characteristic 0 for each replete semi-group P in T, then the existence of a single recurrent point implies that (X,T) is pointwise recurrent and each orbit closure is minimal. This implies of course from a general result of Gottschalk and Hedlund that the transformation group is pointwise almost periodic. The condition P-characteristic 0 is weaker than pointwise equicontinuity even when the phase space is compact--see example (4.6) at the end.     

Finite Abelian Groups with the Strong Endomorphism Kernel Property

An endomorphism h of a group G is said to be strong whenever for every congruence θ on G, (x, y) ∈ θ implies (h(x), h(y)) ∈ θ for every x, y ∈ G. A group G is said to have the strong endomorphism kernel property if every congruence on G is the kernel of a strong endomorphism. In this note, we study the strong endomorphism kernel property in the class of Abelian groups. In particular, we show that a finite Abelian group has the strong endomorphism kernel property if and only if it is cyclic.     

Generalized quasi-Einstein manifolds with harmonic Weyl tensor

In this paper we introduce the notion of generalized quasi-Einstein manifold that generalizes the concepts of Ricci soliton, Ricci almost soliton and quasi-Einstein manifolds. We prove that a complete generalized quasi-Einstein manifold with harmonic Weyl tensor and with zero radial Weyl curvature is locally a warped product with (n ? 1)-dimensional Einstein fibers. In particular, this implies a local characterization for locally conformally flat gradient Ricci almost solitons, similar to that proved for gradient Ricci solitons.     

Inequalities for eigenvalues of a clamped plate problem

In this paper we study eigenvalues of a clamped plate problem on compact domains in complete manifolds. For complete manifolds admitting special functions, we prove universal inequalities for eigenvalues of clamped plate problem independent of the domains of Payne?CPólya?CWeinberger?CYang type. These manifolds include Hadamard manifolds with Ricci curvature bounded below, a class of warped product manifolds, the product of Euclidean spaces with any complete manifolds and manifolds admitting eigenmaps to a sphere. In the case of warped product manifolds, our result implies a universal inequality on hyperbolic space proved by Cheng?CYang. We also strengthen an inequality for eigenvalues of clamped plate problem on submanifolds in a Euclidean space obtained recently by Cheng, Ichikawa and Mametsuka.     

A note on warped product submanifolds of Kenmotsu manifolds

Warped product manifolds are known to have applications in Physics. For instance, they provide an excellent setting to model space-time near a black hole or a massive star (cf. [HONG, S. T.: Warped products and black holes, Nuovo Cimento Soc. Ital. Fis. B 120 (2005), 1227–1234]). The studies on warped product manifolds with extrinsic geometric point of view are intensified after B. Y. Chen’s work on CR-warped product submanifolds of Kaehler manifolds. Later on, similar studies are carried out in the setting of Sasakian manifolds by Hasegawa and Mihai. As Kenmotsu manifolds are themselves warped product spaces, it is interesting to investigate warped product submanifolds of Kenmotsu manifolds. In the present note a larger class of warped product submanifolds than the class of contact CR-warped product submanifolds is considered. More precisely the existence of warped product submanifolds of a Kenmotsu manifold with one of the factors an invariant submanifold is ensured, an example of such submanifolds is provided and a characterization for a contact CR-submanifold to be a contact CR-warped product submanifold is established.