共查询到20条相似文献,搜索用时 819 毫秒
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设(S,·,≤)为偏序可换半群,本文给出将S的偏序≤扩张为满足一定条件的偏序≤*的充要条件.特别地,如果(S,·,≤)为可消偏序可换幺半群,本文给出将S的偏序≤扩张为可消偏序≤*且S的每个元素在≤*下均在正锥中的充要条件.本文还给出将偏序可换幺半群S的偏序≤扩张为≤*且使得S的有限元素子集在≤*下是一条链的充要条件. 相似文献
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利用算子矩阵分块技巧和算子的广义逆研究了复Hilbert空间H上有界线性算子的*-偏序,给出了它们的一些等价刻画. 相似文献
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统筹图又叫计划网络图。任给一个其元素叫做工序(或作业或活动)的有限偏序集,要绘制它的一个最优统筹图,限含虚工序数目为最少者,是一个尚未从理论上解决的问题。本文讨论了虚工序产生的原因和如何减少虚工序数量的一些途径;指出了高度为二的编序集其最优统筹图含虚工序数目达到最大且等于该偏序集框图的边数的充分必要条件;本文给出了一个绘制最优统筹图的近似算法,此算法弥补了文[2]和[3]所给算法的一些不足之处。 相似文献
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在[1]中对局部有限偏序集I={I,≤}及域K引入了关联代数KI的概念.这里的“局部有限”是指对任意a,b∈I,a≤b,集合{x∈I|a≤x≤b}.是有限集.KI的定义是:其元素是域K上以I中元素为行与列的足码的形式矩阵(кa,b)a,b∈I,(即允许有无限多个ka,b≠0)且满足条件:当a≮b时有ka,b=0.注意到I的局部有限性,易知上述形式矩阵的全体关于通常矩阵的加法和乘法以及数乘作成域K上的一个结合代数,称之为I在K上的关联代数KI。 相似文献
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偏序集表示的综合评价模型能将从完全理性范式转换为有限理性范式,进而提升模型应对不确定性的能力,识别评价风险。在偏序集理论的基础上,将权重拓展为偏序权重,解决了部分权重序列条件下评价函数的偏序表示问题。偏序集广义表示定理表明了,偏序表达的函数可以为模糊数、模糊犹豫值、区间数、随机数等多种取值。结果表明:偏序表示的综合评价彻底解决了赋权难题,且充分表达了决策者的个人偏好。从模型运行效果来看,模型处理数据范围增加、评价结果更加稳健可靠,并通过Hasse图展现了方案间的结构化信息,具有分层和聚类的功能。 相似文献
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研究偏序集上的测度拓扑以及与其它内蕴拓扑间的关系,利用测度拓扑刻画了偏序集的连续性.构造了反例说明存在完全分配格,其上的测度拓扑不是连续格从而不是局部紧拓扑. 相似文献
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Mathematical Notes - We study the initial boundary-value problem for three-dimensional systems of equations of pseudoparabolic type. The system is similar to the Oskolkov system, but differs from... 相似文献
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Yu. N. Lin'kov 《Journal of Mathematical Sciences》1991,53(4):409-415
We give a characterization of the types of asymptotic discernibility of families of hypotheses in the case of hypothetical measures that are not, in general, mutually absolutely continuous. The case when the logarithm of the likelihood ratio admits an asymptotic expansion of the type of an expansion with local asymptotic normality is examined in detail. Examples are studied.Translated fromTeoriya Sluchainykh Protsessov, Vol. 15, pp. 64–71, 1987. 相似文献
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S. V. Kerov 《Journal of Mathematical Sciences》1988,41(2):995-999
The asymptotic distribution of tensors of degree N in symmetry types is studied in this paper.Translated from Zapiski Nauchnykh Seminarov Leningradskogo Otdeleniya Matematicheskogo Instituta im. V. A. Steklova AN SSSR, Vol. 155, pp. 181–186, 1986. 相似文献
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In this paper, we prove that any subreduct of the class of representable relation algebras whose similarity type includes
intersection, relation composition and converse is a non-finitely axiomatizable quasivariety and that its equational theory
is not finitely based. We show the same result for subreducts of the class of representable cylindric algebras of dimension
at least three whose similarity types include intersection and cylindrifications. A similar result is proved for subreducts
of the class of representable sequential algebras.
Received October 7, 1998; accepted in final form September 10, 1999. 相似文献
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Vladimir I. Arnold 《Functional Analysis and Other Mathematics》2009,2(2-4):151-164
Empirical study of the period’s length T of the continued fractions of $\sqrt{Q}$ (for growing integers Q) shows several strange asymptotical results, for instance, $T\leq C\sqrt{Q}\ln{Q}$ . These results show important differences between the statistics of the elements of the continued fractions of random real numbers and of square roots of random integers. 相似文献