Subdifferential formulas for a class of non-convex infimal convolutions

In this paper, we provide a number of subdifferential formulas for a class of non-convex infimal convolutions in normed spaces. The formulas obtained unify several results on subdifferentials of the distance function and the minimal time function. In particular, we generalize the results obtained recently by Zhang et al.     

Characterizations and closure under convolution of two classes of multivariate life distributions

Let ?(η) be the class of positive random vectors $\text{T}$ for which min_1?i?nα_iT_i is IFRA (NBU) for all α_i > 0, i = 1,…,n where n is an arbitrary positive integer. Characterizations of the classes ? and η are obtained and utilized to show that η is closed under convolution and that ? is closed under convolution provided one of the two convoluted vectors has independent components.     

Relative n-widths of periodic convolution classes with NCVD-kernel and B-kernel

In this paper,we consider the relative n-widths of two kinds of periodic convolution classes,Kp(K) and Bp(G),whose convolution kernels are NCVD-kernel K and B-kernel G. The asymptotic estimations of Kn(Kp(K),Kp(K))q and Kn(Bp(G),Bp(G))q are obtained for p=1 and ∞,1≤ q≤∞.     

Decompositions of the free additive convolution

We introduce and study a new type of convolution of probability measures, denoted μν and called the s-free additive convolution, which is defined by the subordination functions associated with the free additive convolution. We derive an alternating decomposition of μν for compactly supported μ and ν, using another convolution called orthogonal additive convolution. This decomposition leads to two types of ‘complete’ alternating decompositions of the free additive convolution μ?ν. More importantly, we develop an operatorial approach to the subordination property and introduce the associated notion of s-free independence. Moreover, we establish relations between convolutions associated with the main notions of noncommutative independence (free, monotone and boolean). Finally, our result leads to natural decompositions of the free product of rooted graphs.     

相通连续Domain的若干特征定理

首先引入了相通连续Domain的概念,利用主理想及连通闭集刻画了相通连续Domain; 其次考察了相通完备偏序集的定向完备化,得到了一些好的结果.     

Levels Sets Infimal Convolution and Level Addition

A sufficient criterion is established for the infimal convolution of two functions having connected level sets to share the same property without being exact. As a consequence, the infimal convolution of quasiconvex functions on a real line is quasiconvex. However, this is not true on a space of higher dimension, which is illustrated by an example in R ². Furthermore, connectedness of level sets and local-global minimum properties of functions are analyzed under level addition. Continuity properties of level set maps are also studied in relation with local-global minimum properties.     

关于模糊值凸函数的共轭问题的研究

在Goetschel-Voxman所引进的序关系下,首先给出了模糊值凸函数的共轭函数的概念,并证明了模糊值凸函数的共轭函数是模糊值凸函数等相关性质;其次给出了模糊值凸函数的二次共轭函数的概念,并证明了相关性质;最后讨论了模糊值凸函数的共轭与下卷积之间的关系,证明了两个模糊值凸函数的共轭函数与其下卷积的共轭函数之间的等式关系.     

Two classes of linear equations of discrete convolution type with harmonic singular operators

In this paper, we investigate two classes of linear equations of discrete convolution type with harmonic singular operator. Using the Laurent transform theory, we turn the above linear equations into Riemann boundary value problems. Then, the solutions of the equations are obtained in the class of Hölder continuous functions.     

Power function on stationary classes

We show that under certain large cardinal requirements there is a generic extension in which the power function behaves differently on different stationary classes. We achieve this by doing an Easton support iteration of the Radin on extenders forcing.     

Some classes of analytic functions involving differential subordinations

The main object of this paper is to apply the method of differential subordinations in order to obtain certain properties of some subclasses of analytic functions in the unit disc involving differential subordinations.     

Attainment and (sub)differentiability of the infimal convolution of a function and the square of the norm

Let X be a Banach space whose norm is simultaneously LUR and Gateaux (Fréchet) smooth. Under some assumptions, it is shown that the infimal convolution of a fairly general function on X and the square of the norm is generically strongly attained and hence is Gateaux (Fréchet) differentiable. This contains a result of S. Dutta on distance functions.     

Divisibility classes are seldom closed under flat covers

We show that the class of all divisible modules over an integral domain R is closed under flat covers if and only if R is almost perfect. Also, we show that if the class of all s-divisible modules, where s is a regular element of a commutative ring R, is closed under flat covers then the quotient ring $R/sR$ satisfies some rather restrictive properties. The question is motivated by the recent classification [11] of tilting classes over commutative rings.     

On Some Generalized Polyhedral Convex Constructions

Generalized polyhedral convex sets, generalized polyhedral convex functions on locally convex Hausdorff topological vector spaces, and the related constructions such as sum of sets, sum of functions, directional derivative, infimal convolution, normal cone, conjugate function, subdifferential are studied thoroughly in this paper. Among other things, we show how a generalized polyhedral convex set can be characterized through the finiteness of the number of its faces. In addition, it is proved that the infimal convolution of a generalized polyhedral convex function and a polyhedral convex function is a polyhedral convex function. The obtained results can be applied to scalar optimization problems described by generalized polyhedral convex sets and generalized polyhedral convex functions.     

Modules whose hereditary pretorsion classes are closed under products

A module M is called product closed if every hereditary pretorsion class in σ[M] is closed under products in σ[M]. Every module M which is locally of finite length (every finitely generated submodule of M has finite length) is product closed and every product closed module M is semilocal (M/J(M) is semisimple). Let be product closed and projective in σ[M]. It is shown that (1) M is semiartinian; (2) if M is finitely generated then M satisfies the DCC on fully invariant submodules; (3) M has finite length if M is finitely generated and every hereditary pretorsion class in σ[M] is M-dominated. If the ring R is commutative it is proven that M is product closed if and only if M is locally of finite length.     

正对角元的对称本原矩阵的本原指数集

对含正对角元的对称本原矩阵的本原指数集的分布进行具体的研究,得到几类本原矩阵的分布规律.综述本文的部分结果,可得出<中国科学>1986,No9的"对称本原矩阵的指数集"一文的重要结果"n阶对称本原矩阵的指数集是{1,2,…,2n-2}\{n,…,2n-2}中所有奇数"的又一简单证明.     

The invariance of inner and outer linearly locally connected sets under quasiconformal mappings

In this paper, we prove that the inner and outer linearly locally connected sets of Rn are invariant respectively under quasiconformal mappings which fixed the point at infinity. On the other hand, we prove the converses of above results to be true also.     

Neighborhood properties of certain classes of multivalently analytic functions associated with the convolution structure

In this paper, by making use of the familiar concept of neighborhoods of p-valently analytic functions, we prove coefficient bounds, distortion inequalities and associated inclusion relations for the (n, δ)-neighborhoods of a family of p-valently analytic functions and their derivatives, which is defined by means of a certain general family of non-homogenous Cauchy-Euler differential equations.     

Level sets of a typical function

We determine the level set structure of a typical function.

     

Some reducibilities and splittings of recursively enumerable sets

The existence of a recursively enumerable (RE)T-degreea that does not contain an RE semirecursive setA ∈a with theQ-universal splitting property is proved. Each nonrecursive RE contiguous degree contains an RE setA with the universalT-Q-reduction property, butA is notT-Q-maximal. Each nonrecursive REW-degree contains an RE setA with the universalW-sQ-reduction property, butA is notW-sQ-maximal. Each creative set is partially semimaximal. Translated fromMatematicheskie Zametki, Vol. 66, No. 2, pp. 220–230, August, 1999.