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1.
介绍广义二项式系数   总被引:4,自引:0,他引:4  
1 前言《应用数学进展》 (《Advances in AppliedMathematics》最近一期 ,即第 2 1卷第 2期 ( 1998年 8月 ) ,2 2 8页至 2 40页上刊登了 John Konvali-na的一篇论文 ,题目叫《广义二项式系数和子集-子空间问题》.在这篇论文中 ,Konvalina定义了两种广义二项式系数 ,从而组合地把二项式系数 ,Gauss系数 ,和 Stirling数的基本性质统一起来 .我很喜欢这篇论文 ,认为值得介绍给我国数学界 .这篇论文上印有“1998年 4月 8日 (编辑部 )收到 ,1998年 5月 5日被接受”,可见《应用数学进展》编辑部很喜欢也很重视这篇论文 .2 广义二项式系数设 …  相似文献   

2.
林珍连 《数学研究》2011,44(1):22-26
利用函数论的一般方法给出单位圆盘到自身的调和映照的傅立叶系数的界限,改进并推广了P.Duren和王晓英的相关结果.  相似文献   

3.
研究了Brinkman-Forchheimer方程组解的结构稳定性.首先得到一些有用的先验界,然后在此基础上推出了解所满足的微分不等式,最后建立了解对Brinkman系数v的连续依赖性结果.  相似文献   

4.
21世纪是一个信息化时代,为了更好的面向信息化战争.通过对传统的兰切斯特微分方程进行改进,考虑了信息化的诸多因素,引入了战场情报感知系数和信息优势系数.构建了数学模型,并对其进行差分处理求解,比较分析了交战双方对战场感知系数变化和信息优势系数变化情况下,对战争的影响.以海湾战争为例,检验了模型的可行性.  相似文献   

5.
基于城乡恩格尔系数、基尼系数、社会保障水平系数与城乡人口比,定义城镇、农村与合成的社会和谐系数.此定义考虑了中国的城乡二元结构的特殊国情,能够从经济学的层面较为精确地定量描述国家或地区的社会和谐状态,可用于横向和纵向比较.  相似文献   

6.
本文借助二项式系数求解一类元素有幂次、排列有规律的行列式.阐述了解题思想及方法,指出了解题时应注意的问题,并通过具体例子说明运用本文方法的简便性.  相似文献   

7.
Abstract. In this paper,a class of functional-coefficient regression models is proposed and an estimation procedure based on the locally weighted least equates is suggested. This class of models,with the proposed estimation method,is a powerful means for exploratory data analysis.  相似文献   

8.
利用待定系数的方法研究了一类二阶线性齐次亚纯系数复微分方程的亚纯解及代数元素解的存在性.  相似文献   

9.
范小勤  毕朝晖 《大学数学》2011,27(3):200-203
给出了可化为常系数或可降阶的变系数二阶微分方程的条件及在此条件下求变系数微分方程的解.  相似文献   

10.
傅旭丹  周侠  赵肖东 《数学学报》2008,51(4):693-698
利用一个素数模意义上的整数分拆的结果,证明了高斯二项式系数上的Lucas同余式,并且分别研究了Lucas同余式和Babbage同余式在广义二项式系数上的情况,得到了相应的形式简洁的同余式.  相似文献   

11.
We give analytical bounds on the Value-at-Risk and on convex risk measures for a portfolio of random variables with fixed marginal distributions under an additional positive dependence structure. We show that assuming positive dependence information in our model leads to reduced dependence uncertainty spreads compared to the case where only marginals information is known. In more detail, we show that in our model the assumption of a positive dependence structure improves the best-possible lower estimate of a risk measure, while leaving unchanged its worst-possible upper risk bounds. In a similar way, we derive for convex risk measures that the assumption of a negative dependence structure leads to improved upper bounds for the risk while it does not help to increase the lower risk bounds in an essential way. As a result we find that additional assumptions on the dependence structure may result in essentially improved risk bounds.  相似文献   

12.
在大样本点估计理论中,我们一般只考虑相合估计,对于任何一个相合估计 T_n 以及任何给定的ε>0,其尾概率  相似文献   

13.
In this paper we derive lower bounds and upper bounds on the effective properties for nonlinear heterogeneous systems. The key result to obtain these bounds is to derive a variational principle, which generalizes the variational principle by P. Ponte Castaneda from 1992. In general, when the Ponte Castaneda variational principle is used one only gets either a lower or an upper bound depending on the growth conditions. In this paper we overcome this problem by using our new variational principle together with the bounds presented by Lukkassen, Persson and Wall in 1995. Moreover, we also present some examples where the bounds are so tight that they may be used as a good estimate of the effective behavior.  相似文献   

14.
In this paper, we investigate the bounds of the coefficients of several classes of bi-univalent functions. The results presented in this paper improve of generalize the recent works of other authors.  相似文献   

15.
In this paper, we investigate the bounds of the coefficients of several classes of bi-univalent functions. The results presented in this paper improve or generalize the recent works of other authors.  相似文献   

16.
We obtain upper and lower bounds for the tail of the deficit at ruin in the renewal risk model, which are (i) applicable generally; and (ii) based on reliability classifications. We also derive two-side bounds, in the general case where a function satisfies a defective renewal equation, and we apply them to the renewal model, using the function Λu introduced by [Psarrakos, G., Politis, K., 2007. A generalisation of the Lundberg condition in the Sparre Andersen model and some applications (submitted for publication)]. Finally, we construct an upper bound for the integrated function and an asymptotic result when the adjustment coefficient exists.  相似文献   

17.
In this paper we establish lower bounds for the weakly convergent sequence coefficient WCS(X) of a Banach space X, in terms of some well known moduli and coefficients. By mean of these bounds we identify several properties, of geometrical nature, which imply normal structure. We show that these properties are strictly more general than other previously known sufficient conditions for normal structure.  相似文献   

18.
We consider the error bounds for a piecewise affine inequality system and present a necessary and sufficient condition for this system to have an error bound, which generalizes the Hoffman result. Moreover, we study the error bounds of the system determined by a quadratic function and an abstract constraint.  相似文献   

19.
考虑了带二元连续变利息力的Sparre Andersen风险模型.研究了积累值盈余过程的表达式与性质;在利率递增环境下,利用推广后的调节系数方程组与递归技术推导了最终破产概率的上界,结论表明得到的破产概率上界是更为一般的Lundberg指数上界.  相似文献   

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