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陈天平 《数学年刊A辑(中文版)》1980,1(1):75-82
In articles [1], [2], A. K. Varma investigated some lacunary interpolations by
Spline. In this article we point out a mistake in the proof of Theorem 2 in [1] and
give a new proof. Moreover, the results obtained in [1], [2] are improved. 相似文献
3.
陈天平 《数学年刊B辑(英文版)》1980,1(1):75-82
In articles [1], [2], A. K. Varma investigated some lacunary interpolations by
Spline. In this article we point out a mistake in the proof of Theorem 2 in [1] and
give a new proof. Moreover, the results obtained in [1], [2] are improved. 相似文献
4.
Clear effects criterion is an important criterion for selecting fractional factorial designs [1]. Tang et al. [2] derived upper and lower bounds on the maximum number of clear two-factor interactions (2fi's) in 2n-(n-k) designs of resolution Ⅲ and Ⅳ by constructing 2n-(n-k) designs. But the method in [2] does not perform well sometimes when the resolution is III. This article modifies the construction method for 2n-(n-k) designs of resolution Ⅲ in [2]. The modified method is a great improvement on that used in [2]. 相似文献
5.
Boris Mitiagin 《Integral Equations and Operator Theory》1978,1(2):226-249
This paper is a continuation of [2]. It contains the proof of the main linearization theorem announced in [2], some modifications of the construction and some unsolved problems for the case of several variables. Without further explanation we shall use the notations of [2], and we shall continue the numbering of formulae, sections, theorems and lemmas as begun in [2]. 相似文献
6.
TAN Xiaojiang 《数学年刊B辑(英文版)》2002,23(4):531-538
Lei X be an arbitrary smooth irreducible complex projective curve, E (?) X a rank two vector bundle generated by its sections. The author first represents E as a triple {D1,D2,f}, where D1 , D2 are two effective divisors with d = deg(D1) + deg(D2), and f ∈ H0(X, [D1] |D2) is a collection of polynomials. E is the extension of [D2] by [D1] which is determined by f. By using f and the Brill-Noether matrix of D1 + D2, the author constructs a 2g X d matrix WE whose zero space gives Im{H0(X,[D1]) (?) H0(X, [D1] |D1)}(?)Im{H0(X, E) (?) H0(X,[D2]) (?) H0(X,[D2] |D2)}. From this and H0(X,E) = H0(X, [D1]) (?) Im{H0(X, E) (?) H0(X, [D2])}, it is got in particular that dimH0(X, E) = deg(E) - rank(WE) + 2. 相似文献
7.
用DEA估计生产力进步的探讨 总被引:1,自引:0,他引:1
有关生产力进步的概念与计算,文[1]、[2]基于规模报酬不变的生产前沿面来研究,本文推广到基于一般生产前沿面来研究.因此本文在讨论中用面向输出的C2GS2模型而不是文[1]、[2]中所用的面向输入的C2R模型. 相似文献
8.
本文的主要结果如下:(1)环R关于其乘法封闭子集S满足左Ore条件当且仅当R[σ1,σ2,…,σt]关于其相应乘法封闭子集S[σ1,σ2,…,σt]满足左Ore条件.(2)若R关于其乘法封闭子集S满足左Ore条件,S^-1 R是R关于S的左分式环,其自然同态为φ:R→S^-1R,则存在环同态φ:R[σ1,σ2,…,σt]→S[σ1,σ2,…,σt]^-1 R[σ1,σ2,…σt]使得(S-1R)[φ(σ1),φ-(σ2),…φ(σt)]≌S[σl,σ2,…,σt]^-1R[σ1,σ2,…σt]。 相似文献
9.
We correct a mistake in the proof of [2, Theorem 1.1] and a proof of the main result in [2] is presented without depending on [2, Theorem 1.1]. 相似文献
10.
设F是一个特征不等于2的域,A是,上的一个可除代数。本文研究了A上多项式环A[x1,X2,…,xn]中理想是有限生成的,以及它的Grobner基;也表明F[x1,x2,…,xn]中有限子集G是F[x1,x2,…,xn]的Griobner基当且仅当G是A[x1,x2,…,xn]中的Grobner基。 相似文献
11.
For integers a and b, 0 ? a ? a ? b, an [a, b]-graph G satisties a ? deg(x, G) ? b for every vertex x of G, and an [a, b]-factor is a spanning subgraph F such that a ? deg(x, F) ? b for every vertex x of F. An [a, b]-factor is almost-regular if b = a + 1. A graph is [a, b]-factorable if its edges can be decomposed into [a, b]-factors. When both K and t are positive integers and s is a nonnegative integer, we prove that every [(12K + 2)t + 2ks, (12k + 4)t + 2ks]-graph is [2k,2k + 1]-factorable. As its corollary, we prove that every [r.r + 1]-graph with r ? 12k2 + 2k is [2k + 1]-factorable, which is a partial extension of the two results, one by Thomassen and the other by Era. 相似文献
12.
Let D [d] =(a,b/F) a quaternion divisior algebra over a field F of characteristic ? 2. Denote 1, i, j , k the basis of D, such that i2[d] n, j2[d] b, ij [d] -ji [d] k and A :D → D the involution given by i [d] -i, j [d] j (and k [d] k). In [LE] D. LEWIS asks the following question :Does there exist a quadratic Pfister form [S p. 721 [d] such that the hermitian form [d] [d] D is isotropic over (D, [d]) but not hyperbolic &; In this note, we show that the answer of this question is negative, so that the hermitien level [§I], when it is finite, of (D, A) is a power of two. This result holds for quaternion algebras with standard involution [LE]. 相似文献
13.
Danica Jakubíková-Studenovská 《Czechoslovak Mathematical Journal》2003,53(3):655-668
This paper is a continuation of [5], where k-homogeneous and k-set-homogeneous algebras were defined. The definitions are analogous to those introduced by Fraïssé [2] and Droste, Giraudet, Macpherson, Sauer [1] for relational structures. In [5] we found all 2-homogeneous and all 2-set-homogeneous monounary algebras when the homogenity is considered with respect to subalgebras, to connected subalgebras and with respect to connected partial subalgebras, respectively. The results of [3], where all homogeneous monounary algebras were characterized, were applied in [4] for 1-homogeneity.The aim of the present paper is to describe all monounary algebras which are 2-homogeneous and 2-set-homogeneous with respect to partial subalgebras, respectively; we will say that they are partially-2-homogeneous and partially-2-set-homogeneous. 相似文献
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We compare two different constructions of higher-dimensional parallel transport. On the one hand, there is the two-dimensional parallel transport associated with 2-connections on 2-bundles studied by Baez–Schreiber [2], Faria Martins–Picken [11] and Schreiber–Waldorf [12]. On the other hand, there are the higher holonomies associated with flat superconnections as studied by Igusa [7], Block–Smith [3] and Arias Abad–Schätz [1]. We first explain how by truncating the latter construction one obtains examples of the former. Then we prove that the two-dimensional holonomies provided by the two approaches coincide. 相似文献
16.
关于“四元数自共轭矩阵与行列式的几个定理”的注记 总被引:5,自引:0,他引:5
本刊1985年第4期发表郝稚传的“四元数自共轭矩与行列式的几个定理”(称为〔1〕)的文章的主要工作分为两部分。〔1〕在英文摘要中写到:“(i)This essay has improvedthe conclusion of theorem 8 and theorem 9 in 〔2〕”即〔1〕之第一部分工作在于改进了〔2〕的定理8、9的结果,其根据就是〔1〕的定理1、2.〔1〕称定理1—若 相似文献
17.
曾庆光 《应用数学与计算数学学报》1995,9(1):89-96
本文我们考虑具有线性约束凹函数的最优化问题,利用我们的算法和变尺度修正公式,提出了一个结构简单的组合算法,并在「2」,「3」和「4」同样的假设条件下,证明了该算法的收敛性和超线性收敛速度,从而使该算法比原有各算法更具实用性。 相似文献
18.
本文推广CNastasecu,F.VanOystaeyen的有关结果,并在一定条件下回答了K.R.Fuller等人的公开问题. 相似文献
19.
Meng-Kuang Kuo 《数学物理学报(B辑英文版)》2011,31(3):1203-1212
The almost convergent function which was introduced by Raimi [6] and discussed by Ho [4], Das and Nanda [2, 3], is the continuous analogue of almost convergent sequences (see [5]). In this paper, we establish the Tauberian conditions and the Cauchy criteria for weak almost convergent functions on R~2+ . 相似文献
20.
Clear effects criterion is an important criterion for selecting fractional factorial designs[1].Tang et al.[2]derived upper and lower bounds on the maximum number of clear two-factor interactions(2fi's)in 2^n-(n-k)designs of resolution Ⅲ and Ⅳ by constructing 2^n-(n-k)designs.But the method in[2]does not perform well sometimes when the resolution is Ⅲ.This article modifies the construction method for 2^n-(n-k) designs of resolution Ⅲ in[2].The modified method is a great improvement on that used in[2]. 相似文献