共查询到20条相似文献,搜索用时 15 毫秒
1.
H. Herrlich asked in Topology Appl.
49 (1993), 251–264, whether there are nontrivial classes of topological spaces that are almost reflective and almost coreflective at the same time. This question was dealt with (in Huek and Tozzi, Appl. Categ. Structures
4 (1996), 57–68) in a more general setting than almost reflective and almost coreflective classes. The present paper investigates a modified question: when a nontrivial generalized reflective class of topological or uniform spaces is equivalent to a generalized coreflective class of spaces. 相似文献
2.
Á. Császár 《Acta Mathematica Hungarica》2002,96(4):351-357
The paper defines, with the help of generalized topologies and generalized neighbourhood systems, two kinds of generalized
continuity, by giving in this way a general form to various concepts discussed in the literature. In particular, generalized
continuity admits a characterization furnishing a known charcterization of θ-continuous maps.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
3.
Banach空间中线性算子的齐性广义逆 总被引:9,自引:0,他引:9
本文首先在Banach空间内引进拟线性投影算子的概念,由此给出Banach空 间内线性算子的齐性广义逆的统一定义。齐性广义逆包含线性广义逆、单值度量广义 逆.本文证得齐性广义逆存在的充分必要条件. 相似文献
4.
The main notions and tools from white noise analysis are set up on the basis of the calculus of Gaussian random variables and the S -transform. A new proof of the formula for the S -transform of Itô integrals is given. Moreover, measurability and the martingale property with respect to the Brownian filtration are characterized in terms of the S-transform. This allows the extension of these notions to random variables and processes, respectively, in the space of Hida distributions. 相似文献
5.
The concept of the operators of generalized monotone type is introduced and iterative approximation methods for a fixed point of such operators by the Ishikawa and Mann iteration schemes {xn} and {yn} with errors is studied. Let X be a real Banach space and T : D ? X → 2D be a multi‐valued operator of generalized monotone type with fixed points. A new general lemma on the convergence of real sequences is proved and used to show that {xn} converges strongly to a unique fixed point of T in D. This result is applied to the iterative approximation method for solutions of nonlinear equations with generalized strongly accretive operators. Our results generalize many of know results. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
6.
7.
Sigeo Aki Hisataka Kuboki Katuomi Hirano 《Annals of the Institute of Statistical Mathematics》1984,36(1):431-440
Summary This paper gives some results on calculation of probabilities and moments of the discrete distributions of orderk. Further, a new distribution of orderk, which is called the logarithmic series distribution of orderk, is investigated. Finally, we discuss the meaning of theorder of the distributions.
The Institute of Statistical Mathematics 相似文献
8.
广义n阶Euler-Bernoulli多项式 总被引:25,自引:2,他引:23
刘国栋 《数学的实践与认识》1999,29(3):5-10
本文得到了广义n阶Euler数和广义n阶Bernoulli数,广义n阶Euler多项式和广义n阶Bernoulli多项式的关系式。 相似文献
9.
10.
11.
三角代数上的广义Jordan导子 总被引:1,自引:0,他引:1
主要研究了三角代数上的广义Jordan导子.利用三角代数上广义Jordan导子和广义内导子的联系.证明了作用在一个含单位元的可交换环上的三角代数到其自身上的环线性广义Jordan导子是一个广义导子. 相似文献
12.
对文[1]中关于多项式不动点的主要定理进行了修正和发展,进而研究了多项式的广义(高阶)不动点,证明了对任意给定的n个点t_1≤t_2≤…≤t_n,存在唯一的首项系数为α∈R(α≠0)的n次多项式P(x)以它们为广义不动点. 相似文献
13.
《代数通讯》2013,41(9):3051-3060
ABSTRACT In this article we formulate basic results on outer generalized inverses of elements in rings. We characterize elements which have the same idempotents related to their particular outer generalized inverses and investigate positive generalized inverses in C*-algebras. 相似文献
14.
15.
研究了Hilbert空间上范数连续广义算子半群的特征条件.利用广义半群的的预解式,给出了广义算子半群范数连续的充分条件. 相似文献
16.
In this paper, the set-convexity and mapping-convexity properties of the extended images of generalized systems are considered. By using these image properties and tools of topological linear spaces, separation schemes ensuring the impossibility of generalized systems are developed. Then, special problem classes are investigated. 相似文献
17.
We continue our study of generalized conjugations for functions with values in the canonical enlargement of a complete ordered group, started in [10], which encompass various kinds of known conjugations and polarities. We obtain extensions, to this framework, of some results on d.c. duality theory and subdifferentials, and we give some applications to conjugations and subdifferentials for functions with values in
. 相似文献
18.
研究了Hilbert空间上最终范数连续广义算子半群的特征条件,利用半群的生成元的预解式,给出了Hilbert空间上广义算子半群范数连续的三个特征条件. 相似文献
19.
Generalized monotonicity and generalized convexity 总被引:2,自引:0,他引:2
S. Komlósi 《Journal of Optimization Theory and Applications》1995,84(2):361-376
Generalized monotonocity of bifunctions or multifunctions is a rather new concept in optimization and nonsmooth analysis. It is shown in the present paper how quasiconvexity, pseudoconvexity, and strict pseudoconvexity of lower semicontinuous functions can be characterized via the quasimonotonicity, pseudomonotonicity, and strict pseudomonotonicity of different types of generalized derivatives, including the Dini, Dini-Hadamard, Clarke, and Rockafellar derivatives as well.This research was supported by the National Science Foundation of Hungary, Grant No. OTKA 1313/1991. 相似文献
20.
Michael Kunzinger Michael Oberguggenberger Roland Steinbauer James A. Vickers 《Acta Appl Math》2004,80(2):221-241
Based on the concept of manifold-valued generalized functions, we initiate a study of nonlinear ordinary differential equations with singular (in particular: distributional) right-hand sides in a global setting. After establishing several existence and uniqueness results for solutions of such equations and flows of singular vector fields, we compare the solution concept employed here with the purely distributional setting. Finally, we derive criteria securing that a sequence of smooth flows corresponding to the regularization of a given singular vector field converges to a measurable limiting flow. 相似文献