局部凸I-拓扑线性空间的若干性质

利用广义模糊半范数族来研究了Katsaras意义下的局部凸Ⅰ-拓扑线性空间的某些性质,如分离性、模糊点网的收敛性、模糊集的有界性,以及同一个集上两个局部凸Ⅰ-拓扑的“粗“细”比较等。     

Equicontinuous Seton Locally Convex Spaces

Ｌｅｔ（Ｅ，γ）ｂｅａｌｏｃａｌｌｙｃｏｎｖｅｘｓｐａｃｅａｎｄＥ′ｉｔｓｃｏｎｊｕｇａｔｅｓｐａｃｅ．ＡＥ′ｂｅａｎｅｑｕｉｃｏｎｔｉｎｕ－ｏｕｓｓｅｔｏｎ（Ｅ，γ）．ＴｈｅｗｅｌｌｋｎｏｗｎＡｌａｏｇｌｕ－ＢｏｕｒｂａｋｉＴｈｅｏｒｅｍ（［１］Ｐ２４８）ｓｔａｔｅｓｔｈａｔｅａｃｈｅ－ｑｕｉｃｏｎｔｉｎｕｏｕｓｓｅｔｏｎ（Ｅ，γ）ｉｓσ（Ｅ′，Ｅ）ｒｅｌａｔｉｖｅｌｙｃｏｍｐａｃｔｓｕｂｓｅｔ．Ｎｅｖｅｒｔｈｅｌｅｓｓ，ｅｑｕｉｃｏｎｔｉｎｕｏｕｓｓｅｔｉｓσ（Ｅ′，Ｅ）ｒｅｌａｔｉｖｅｌ…     

局部凸空间的余逼近

研究了在局部凸空间中的ｆ－余逼近和强ｆ－余逼近的一些性质．     

Maximization of Generalized Convex Functionals in Locally Convex Spaces

The major part of the investigation is related to the problem of maximizing an upper semicontinuous quasiconvex functional f over a compact (possibly nonconvex) subset K of a real Hausdorff locally convex space E. A theorem by Bereanu (Ref. 1) says that the condition f is quasiconvex (quasiconcave) on K is sufficient for the existence of maximum (minimum) point of f over K among the extreme points of K. But, as we prove by a counterexample, this is not true in general. On the further condition that the convex hull of the set of extreme points of K is closed, we show that it is sufficient to claim that f is induced-quasiconvex on K to achieve an equivalent conclusion. This new concept of quasiconvexity, which we define by requiring that each lower-level set of f can be represented as the intersection of K with some convex set, is suitable for functionals with a nonconvex domain. Under essentially the same conditions, we prove that an induced-quasiconvex functional f is directionally monotone in the sense that, for each y K, the functional f is increasing along a line segment starting at y and running to some extreme point of K. In order to guarantee the existence of maximum points on the relative boundary r K of K, it suffices to make weaker demands on the function f and the space E. By introducing a weaker kind of directional monotonicity, we are able to obtain the following result: If f is i.s.d.-increasing i.e., for each y y K, there is a half-line emanating from y such that f is increasing along this half-line, then f attains its maximum at rK , even if E is a topological linear Hausdorff space (infinite-dimensional and not necessarily locally convex). We state further a practical method of proving i.s.d.-monotonicity for functions in finite-dimensional spaces and we discuss also some aspects of classification.     

局部凸空间中的f-宽度

本文将赋范空间中的宽度推广到了局部凸空间,并得到了一些相应的结论.     

局部凸空间中的齐次嵌入子空间

在本文中，将齐次嵌入子空间概念引入了局部凸空间中，并讨论了它们了逼近性质．     

Locally Convex Spaces with Radon-Nikodym Property

Reflexive BANCH spaces and separable duals of BANACH spaces posses the RADON -NIKODYM Property. The purpose of this paper is to extend these results to locally convex spaces. As the examples will show, these RNP-spaces include most spaces which occur frequently in Functional Analysis.     

Dense Near-Rings of Operators on Locally Convex Spaces

We consider the near-ring C(V) of all continuous operators on a locally convex space V. Like in the Theorem of Stone-Weierstrass the question arises which subnear-rings N have the property that every operator in C(V) can be approximated by elements of N on compact subsets of V. It is our aim to show that this can be achieved with certain primitive subnear-rings of C(V). For this we invoke a deep Theorem of Wielandt-Betsch on interpolation properties of primitive near-rings. We also stress the fact that such a Theorem of Stone-Weierstrass type can only be obtained in the context of near-rings.     

Weakly Unconditional Cauchy Series on Locally Convex Spaces

Ｗｅａｋｌｙ　Ｕｎｃｏｎｄｉｔｉｏｎａｌ　Ｃａｕｃｈｙ　Ｓｅｒｉｅｓ　ｏｎ　Ｌｏｃａｌｌｙ　Ｃｏｎｖｅｘ　ＳｐａｃｅｓＬｉＲｏｎｇｌｕ（李容录）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，ＨａｒｂｉｎＩｎｓｔｉｔｕｔｅｏｆＴｅｃｈｎｏｌｏｇｙ，...     

Transitive and Hypercyclic Operators on Locally Convex Spaces

Solutions are provided to several questions concerning topologicallytransitive and hypercyclic continuous linear operators on Hausdorfflocally convex spaces that are not Fréchet spaces. Amongothers, the following results are presented. (1) There existtransitive operators on the space of all finite sequences endowedwith the finest locally convex topology (it was already knownthat there is no hypercyclic operator on . (2) The space ofall test functions for distributions, which is also a completedirect sum of Fréchet spaces, admits hypercyclic operators.(3) Every separable infinite-dimensional Fréchet spacecontains a dense hyperplane that admits no transitive operator.2000 Mathematics Subject Classification 47A16 (primary), 46A03,46A04, 46A13, 37D45 (secondary).     

Weakly Compact Composition Operators on Locally Convex Spaces

Let E be a complete, barrelled locally convex space, let V = (v_n) be an increasing sequence of strictly positive, radial, continuous, bounded weights on the unit disc 𝔻 of the complex plane, and let φ be an analytic self map on 𝔻. The composition operators C_φ : f → f ○ φ on the weighted space of holomorphic functions HV (𝔻, E) which map bounded sets into relatively weakly compact subsets are characterized. Our approach requires a study of wedge operators between spaces of continuous linear maps between locally convex spaces which extends results of Saksman and Tylli [31, 32], and a representation of the space HV (𝔻, E) as a space of operators which complements work by Bierstedt , Bonet and Galbis [4] and by Bierstedt and Holtmanns [6].     

Linear Monotone Subspaces of Locally Convex Spaces

The main focus of this paper is to study multi-valued linear monotone operators in the context of locally convex spaces via the use of their Fitzpatrick and Penot functions. Notions such as maximal monotonicity, uniqueness, negative-infimum, and (dual-)representability are studied and criteria are provided.     

Duality and Reflexivity of Spaces of Approximable Polynomials on Locally Convex Spaces

 We develop a duality theory for spaces of approximable n-homogeneous polynomials on locally convex spaces, generalising results previously obtained for Banach spaces. For E a Fréchet space with its dual having the approximation property and with E′ _b locally Asplund we show that the space of n-homogeneous polynomials on (E′ _b )′ _b is the inductive dual of the space of boundedly weakly continuous n-homogeneous polynomials on E. We show that when E is a reflexive Fréchet space, the space of n-homogeneous polynomials on E is reflexive if and only if every n-homogeneous polynomial on E is boundedly weakly continuous. (Received 24 March 1999; in final form 14 February 2000)     

局部凸空间中的不动点定理

证明了局部凸空间中非凸集上的上半连续凝集值映射的一个Ｌｅｒａｙ－Ｓｃｈａｕｄｅｒ型不动点定理,并推广了一些已知的不动点定理。     

局部凸可分离空间中的Drop定理

本文给出两个局部凸可分离空间中的Drop定理,其中一个严格强于丘京辉建立的结果,也严格强于郑喜印建立的结果(限制到局部凸可分离空间),另一个则使丘京辉提出的“局部凸空间中的弱序列紧凸子集具有弱Drop性质”这一定理的证明变得较为简单了．     

Duality and Reflexivity of Spaces of Approximable Polynomials on Locally Convex Spaces

 We develop a duality theory for spaces of approximable n-homogeneous polynomials on locally convex spaces, generalising results previously obtained for Banach spaces. For E a Fréchet space with its dual having the approximation property and with E′ _b locally Asplund we show that the space of n-homogeneous polynomials on (E′ _b )′ _b is the inductive dual of the space of boundedly weakly continuous n-homogeneous polynomials on E. We show that when E is a reflexive Fréchet space, the space of n-homogeneous polynomials on E is reflexive if and only if every n-homogeneous polynomial on E is boundedly weakly continuous.     

Proper Efficiency in Locally Convex Topological Vector Spaces

We present a general treatment of proper efficiency, which was originally given in normed vector spaces; we introduce a new kind of efficiency in locally convex topological vector spaces. We examine the relationships among these efficiencies. As an application, we prove a strong Ekeland variational principle.     

An Implicit Function Theorem in Locally Convex Spaces

The notion of strict differentiability in BANACH spaces is generalized to locally convex spaces in such a way, that computations in the bornological operator ideal of bounded operators play the role of norm estimations. We get a remarkably rich theory including not only the easy formulas like the chain rule, but also the deep theorems like the implicit function theorem. The BANACH space proofs can be translated almost literally.