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本文考虑了欧式空间R ̄n中任意单纯形剖分上的样条函数空间.证明了当k≥(3μ+1)2 ̄(n-2)+1时,计算任意单纯形剖分Δ上的k次μ阶光滑样条空间的维数,可归结为计算每个σ-关联域(i-单纯形σ∈Δ)R(σ)上的2 ̄(n-i-1)μ次μ阶光滑(i≤n-1)样条空间的维数。这里σ-关联域R(σ)是指Δ中所有包含σ的单纯形所成的单纯形剖分.  相似文献   
2.
Let U_n be a U-statistic with symmetric kernel h(x,y) such that Eh(X_1,X_2)=θ and Var E[h(X_1,X_2)-θ|X_j]>0.Let f(x) be a function defined on R and f″ be bounded.If f(θ) is the parameterof interest,a natural estimator is f(U_n).It is known that the distribution function of z_n=(n~(1/2){Jf(U_n)-f(θ)})/(S_n~*) converges to the standard normal distribution Φ(x) as n→∞,where Jf(U_n) isthe jackknife estimator of f(U_n),and S_n~(*2) is the jackknife estimator of the asymptotic variance ofn~(1/2) Jf(U_n).It is of theoretical value to study the rate of the normal approximation of the statistic.In this paper,assuming the existence of fourth moment of h(X_1,X_2),we show that(?)|P{z_n≤x}-Φ(x)|=O(n~(-1/2)log n).This improves the earlier results of Cheng(1981).  相似文献   
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本文在逐次分解法的基础上,给出一种样条机械化求解方法.该方法对多项式样条,有理样条乃至更一般样条的研究都是十分有效的.它适用于三角剖分,矩形剖分乃至更一般的代数曲线剖分  相似文献   
4.
本文指出了现行数学分析教本中有关重积分换元公式证明所普遍忽视的一个漏洞,同时给出了该公式的一个新的初等证明.  相似文献   
5.
In this paper, we propose jackknife only for a particular class of non-symmetric statistics, which is incomplete U-statistics of significance in practice. We find that if we deal with incomplele U-statistics using a slightly modified jackknife, then Tu-key's conjecture will be true, and the consistent estimator of asymptotic variance is given. Thus we obtain an approximate confidence interval for reguluar function g (θ).  相似文献   
6.
In this note some recurrence relations for the dimensions of the spline spaces on so called 0-stars are presented. The work of this author is supported by the Alexander von Humboldt Foundation This paper is completed at Free Univ. Berlin, Inst. of Math., Arnimallee 2–6, 1000 Berlin 33, Germany  相似文献   
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