Weak Compactness Today

We give a short proof of the Smul'yan, Eberlein and Grothendiecktheorem that is so transparent that one can easily deduce anumber of results about weak compactness in locally convex spaces.     

向量优化问题弱有效解集的非空性和紧性刻画

考虑有限维空间Rn(n＞1)中目标映射是仿凸锥映射的向量优化问题.通过对偶锥的端方向和标量函数的0-强制性给出了弱有效解集非空性和紧性的刻画.     

Solving Mixed Variational Inequalities Beyond Convexity

Journal of Optimization Theory and Applications - We show that Malitsky’s recent Golden Ratio Algorithm for solving convex mixed variational inequalities can be employed in a certain...     

Polynomials,Symmetric Multilinear Forms and Weak Compactness

In this paper we obtain some versions of weak compactness James theorem, replacing bounded linear functionals by polynomials and symmetric multilinear forms.     

空间l∞(Xn)中的弱紧性

本文首先得到了以l_∞(X_n)为值域的有界线性算子为弱紧算子的一个充要条件和一个充分条件，讨论了l_∞(X_n)中的弱收敛，然后给出了l_∞(X_n)中弱紧性的几种等价刻画．     

Generic Well-Posedness of Constrained Variational Problems Without Convexity Assumptions

In our previous work, a generic well-posedness result (with respect to variations of the integrand of the integral functional) without the convexity condition was established for a class of optimal control problems satisfying the Cesari growth condition. In this paper, we extend this generic well-posedness result to classes of constrained variational problems in which the values at the endpoints and constraint maps are also subject to variations.     

Weak Continuity and Compactness for Nonlinear Partial Differential Equations

This paper presents several examples of fundamental problems involving weak continuity and compactness for nonlinear partial differential equations, in which compensated compactness and related ideas have played a significant role. The compactness and convergence of vanishing viscosity solutions for nonlinear hyperbolic conservation laws are first analyzed, including the inviscid limit from the Navier-Stokes equations to the Euler equations for homentropic flow, the vanishing viscosity method to construct the global spherically symmetric solutions to the multidimensional compressible Euler equations, and the sonic-subsonic limit of solutions of the full Euler equations for multi-dimensional steady compressible fluids. Then the weak continuity and rigidity of the Gauss-Codazzi-Ricci system and corresponding isometric embeddings in differential geometry are revealed. Further references are also provided for some recent developments on the weak continuity and compactness for nonlinear partial differential equations.     

A Simple Proof of the Borel Extension Theorem and Weak Compactness of Operators

Let T be a locally compact Hausdorff space and let C ₀(T) be the Banach space of all complex valued continuous functions vanishing at infinity in T, provided with the supremum norm. Let X be a quasicomplete locally convex Hausdorff space. A simple proof of the theorem on regular Borel extension of X-valued -additive Baire measures on T is given, which is more natural and direct than the existing ones. Using this result the integral representation and weak compactness of a continuous linear map u: C ₀(T) X when c ₀ X are obtained. The proof of the latter result is independent of the use of powerful results such as Theorem 6 of [6] or Theorem 3 (vii) of [13].     

Nonemptiness and Compactness of Solution Sets to Weakly Homogeneous Generalized Variational Inequalities

Journal of Optimization Theory and Applications - In this paper, we deal with the weakly homogeneous generalized variational inequality, which provides a unified setting for several special...     

Duality and Weak Efficiency in Vector Variational Problems

We establish weak, strong, and converse duality results for weakly efficient solutions in vector or multiobjective variational problems, which extend and improve recent papers. For this purpose, we consider Kuhn–Tucker optimality conditions, weighting variational problems, and some classes of generalized convex functions, recently introduced, which are extended in this work. Furthermore, a related open question is discussed.     

Weak Sharp Solutions for Nonsmooth Variational Inequalities

In this paper, we study the weak sharp solutions for nonsmooth variational inequalities and give a characterization in terms of error bound. Some characterizations of solution set of nonsmooth variational inequalities are presented. Under certain conditions, we prove that the sequence generated by an algorithm for finding a solution of nonsmooth variational inequalities terminates after a finite number of iterates provided that the solutions set of a nonsmooth variational inequality is weakly sharp. We also study the finite termination property of the gradient projection method for solving nonsmooth variational inequalities under weak sharpness of the solution set.     

Characterizing the Nonemptiness and Compactness of the Solution Set of a Vector Variational Inequality by Scalarization

In this paper, the nonemptiness and compactness of the solution set of a pseudomonotone vector variational inequality defined in a finite-dimensional space are characterized in terms of that of the solution sets of a family of linearly scalarized variational inequalities.     

Weak Differentiability with Applications to Variational Analysis

In this paper we first review the theory of weak differentiability with some improvements and unifications of existing results; then we introduce an extended variant of this notion and establish its basic properties; finally we use the weak differentiability and its variant to develop new calculus results in variational analysis for the theory of generalized differentiation and the sequential normal compactness. In this way we demonstrate that the weak differentiability and its variant, in contrast to the usual differentiability, are in fact more suitable for Fréchet and limiting/Mordukhovich constructions in variational analysis.     

Closed Tripotents and Weak Compactness in the Dual Space of a Jb*-Triple

We revise the concept of compact tripotent in the bidual spaceof a JB*-triple. This concept was introduced by Edwards andRüttimann generalizing the ideas developed by Akemann forcompact projections in the bidual of a C*-algebra. We also obtainsome characterizations of weak compactness in the dual spaceof a JC*-triple, showing that a bounded subset in the dual spaceof a JC*-triple is relatively weakly compact if and only ifits restriction to any abelian maximal subtriple C is relativelyweakly compact in the dual of C. This generalizes a very usefulresult by Pfitzner in the setting of C*-algebras. As a consequencewe obtain a Dieudonné theorem for JC*-triples which generalizesthe one obtained by Brooks, Saitô and Wright for C*-algebras.     

Global Stability Results for the Weak Vector Variational Inequality

In this paper, we consider the global stability of solutions of a Weak Vector Variational Inequality in a finite-dimensional Euclidean space. Upper semi-continuity of the solution set mapping is established. And by a scalarization method, we derive a sufficient condition that guarantees the lower semi-continuity of the solution set mapping for the Weak Vector Variational Inequality     

Traveling Wave Solutions in an Integrodifference Equation with Weak Compactness

This article studies the existence of traveling wave solutions in an integrodifference equation with weak compactness. Because of the special kernel function that may depend on the Dirac function, traveling wave maps have lower regularity such that it is difficult to directly look for a traveling wave solution in the uniformly continuous and bounded functional space. In this paper, by introducing a proper set of potential wave profiles, we can obtain the existence and precise asymptotic behavior of nontrivial traveling wave solutions, during which we do not require the monotonicity of this model.     

The Weak Compactness of the Sets of L1(

设(     

On Non-local Variational Problems with Lack of Compactness Related to Non-linear Optics

We give a simple proof of the existence of solutions of the dispersion management and diffraction management equations for a zero average dispersion, respectively, diffraction. These solutions are found as maximizers of non-linear and non-local variational problems which are invariant under a large non-compact group. Our proof of the existence of a maximizer is rather direct and avoids the use of Lions’ concentration compactness argument or Ekeland’s variational principle. The existence of diffraction managed solitons in the discrete case is shown under the weakest possible assumptions on the diffraction profile, and the existence of dispersion managed solitons in the continuous case is shown under very mild conditions on the dispersion profile, which cover all physically relevant cases.     

Remarks on Interpolation Properties of the Measure of Weak Non -- Compactness and Ideal Variations

We estimate the ideal measure of certain interpolated operators in terms of the measure of their restrictions to the intersection. The dual situation is also studied. Special attention is paid to the ideal of weakly compact operators.     

Variational Problem,Generalized Convexity,and Application to a Competitive Equilibrium Problem

The main purpose of this article is to present a new formulation of a competitive equilibrium in terms of a suitable quasivariational inequality involving multivalued maps. More precisely, a pure exchange economy is considered where the consumer's preferences are represented by utility functions that we assume to be generalized concave and non-differentiable. In the concave context, we have characterized the equilibrium by means of a variational problem involving the subdifferential. Now, by relaxing concavity and differentiability assumptions on utility functions, the subdifferential operator of the utility function is replaced by a suitable multimap involving a new concept, recently introduced in [1 D. Aussel and N. Hadjisavvas ( 2005 ). Adjusted sublevel sets, normal operator and quasiconvex programming . SIAM J. Optim. 16 : 358 – 367 .[Crossref], [Web of Science ®] , [Google Scholar]]: the normal operator to the adjusted sublevel sets. Thanks to this variational formulation we are able to achieve the existence of equilibrium points by using arguments of the set-valued analysis. Finally, we provide some example of utility functions which verify our assumptions.