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1.
In this paper, the dimension of the spaces of bivariate spline with degree less that 2r and smoothness order r on the Morgan-Scott triangulation is considered. The concept of the instability degree in the dimension of spaces of bivariate spline is presented. The results in the paper make us conjecture the instability degree in the dimension of spaces of bivariate spline is infinity. 相似文献
2.
The paper discusses the relationship between weights and control vertices of two rational NURBS curves of degree two or three with all weights larger than zero when they represent the same curve parametrically and geometrically, and gives sufficient and necessary conditions for coincidence of two rational NURBS curves in non-degeneracy case. 相似文献
3.
Wang Renhong Zhou Heng 《分析论及其应用》2003,19(3)
1 IntroductionLet Sd- 1 bethe unitsphere of Rd,Πdthe space of allpolynomialsofd variables,and x(i)= (x1 ,… ,xi) (i=1 ,… ,d) .In this paper,we are concerned with the homogeneous polyno-mials orthogonal with the weightfunction h(x(d) ) =x2 k11 …x2 kdd on Sd- 1 ,where ki≥ 0 (i=1 ,… ,d) .Connected with the weightfunction h(x(d) ) are the following differential-differenceoperators introduced by Charles F. Dunkl in [3 ] ,Dip(x(d) ) = p(x(d) ) xi+ di=1kip(x(d) ) -p(x1 ,… ,-xi,… ,xd)xi,Δ… 相似文献
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5.
作者们在[4]中已经指出了给定剖分下多元B-样条存在的必要条件(1).它表明,并不是对所有的剖分都有多元B-样条存在的。人们也许以为,如同一元情况一样,只要多元B-样条存在,则它们一定组成多元样条空间的支集(即多元样条空间是所有多元B-样条所支架起来的空间)。本文以标准的三角剖分(2-单纯形)下,多元样条空间S2:=S42为例指出这种认识是错误的。事实上,本文定理2,3和4对这个问题已给出了明确的结论。 以上结论说明多元B-样条并不是基本的 相似文献
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7.
ZhiqiangXu RenhongWang 《逼近论及其应用》2002,18(1):68-80
In this paper ,the dimension of the spaces of bivariate spline with degree less that 2r and smoothness order r on the Morgan-Scott triangulation is consdered.The concept of the instability degree in the dimension of spaces of bivariate spline is presented.The resulats in the paper make us conjecture the instability degree in the dimension of spaces of bivariate spline is infinity. 相似文献
8.
In this paper we prove that there are no locally supported bivariate G~(k-1)spline functionsof degree k on cross-cut grid partitioned regions with no more than three lines meeting at acommon vertex.We also give explicit expressions of bivariate C~1 cubic B-spline with smallestlocal support on cross-cut triangular grid partitioned regions where each vertex is theintersection of three lines.Properly normalized,these B-splines are proved to be uniquelydetermined and form a partition of unity.Furthermore,the corresponding waxationdiminishing bivariate spline operators are proved to preserve all linear polynomials of twovariables.These facts enable us to give error estimates for approximation by bivariate C~1cubic splines for functions of class C,C~1 and C~2. 相似文献
9.
Chen Renhong Mei Jie Xu Jin Xu Wanjie Wang Laisen Chen Yuanzhi Peng Dong-Liang 《Journal of Solid State Electrochemistry》2022,26(6):1359-1368
Journal of Solid State Electrochemistry - High-voltage LiNi0.5Mn1.5O4 with a spinel structure is considered as important cathode materials for high-energy density Li-ion batteries (LIBs). In this... 相似文献
10.
根据研究多元弱样条函数的B—网方法,给出了某些多元弱样条函数空间的最小确定集的构造方法,并从而求出了它们的维数.本文还讨论了对偶基的局部支集性质。 相似文献