方阵的开方问题

运用Jordan标准形理论,完整解决了复数方阵、实数方阵能否开平方、开立方的问题.     

A New Family of Ternary Sequences with Ideal Two-level Autocorrelation Function

Let be a primitive element of . Letd=3^2k -3 ^k +1 wheren=3k. We show that the ternary sequence s(t) given by has a two-level idealautocorrelation function.     

线性递归序列的矩阵表示

先给出k阶线性递归序列的矩阵表示,然后用矩阵方法得到2阶线性递归序列的通项及一些恒等式.     

On the Seneta Sequences

In this paper, we prove some properties of the Seneta sequences and functions, and in particular we prove a representation theorem in the Karamata sense for the sequences from the Seneta class SOc.     

探测方向性时间序列的相依性的标准偏自相关

我们建立了一个方法去探测线性与方向性时间序列的分段相依。Ｊｕｐｐ＆Ｍａｒｄｉｎ提出了流形上二元分布和二元角分布的相关函数。基于他们的工作，我们对方向性时间序列的自相关函数及偏相关函数提出了新的定义，而且我们用这些新的定义做了一些模拟工作，并应用在实际的数据上，得到了一些令人满意的结果。     

具有k重零特征根的矩阵的性质

本文对具有 k重零特征根的矩阵的一些性质进行了探讨 ,这些性质主要涉及到矩阵的秩、矩阵的有理标准形和约当标准形等方面     

Hamilton－Cayley定理的另一种证法

本文提出了线性代数中重要的Ｈａｍｉｌｔｏｎ－Ｃａｙｌｅｙ定理的另一种证明．     

Intersection Divisors of a Canonically Embedded Curve with its Osculating Spaces

We present a new result on the geometry of nonhyperelliptic curves; namely, the intersection divisors of a canonically embedded curve C with its osculating spaces at a point P, not considering the intersection at P, can only vary in dimensions given by the Weierstrass semigroup of the curve C at P. We obtain, under a reasonable geometrical hypothesis, monomial bases for the spaces of higher-order regular differentials. We also give a sufficient condition on the Weierstrass semigroup of C at P in order for this geometrical hypothesis to be true. Finally, we give examples of Weierstrass semigroups satisfying this condition.     

Jordan标准形定理的初等变换证明

本文对 Jordan标准形定理给出了一种使用初等变换的证明 ,直观意义明显、易于理解 ,可用于线性代数教学 .     

实随机矩阵的Jordan标准型

“正好有非线性初等因子的矩阵在实际工作中几乎是不存在的 .…… ,舍入误差通常将导致一个已经不再有非线性初等因子的矩阵”[3 ] ,根据 J.H.Wilkinson揭示的这些客观规律 ,以及 G.H.Golub给出的结论 :“Rn× n中的可对角化矩阵在 Rn× n中是稠密的”[1 ] ,使我们联想到以下命题成立的可能性 :“在 Rn× n中具有重特征值的矩阵集合的 L ebesgue测度为零”.本文的主题就是证明该命题成立 .引理　设 F(x1 ,… ,xm)为变元 x1 ,… ,xm的实系数多项式 ,那么μm{ x|F(x) =0 ,‖ x‖ 相似文献   

一类条件数为常数的随机辛阵的性质

对A.Bunse-Gerstner和V.Mehrmann使用的一种随机辛阵的性质进行了研究.证明了1)其可以通过正交相似变换化为一种特殊的Schur标准型;2)其条件数为一常数;3)该常数约为2618.     

D-Gap Functions for Nonsmooth Variational Inequality Problems

We study the Clarke generalized gradient of the D-gap functions for the variational inequality problem (VIP) defined by a locally Lipschitz, but not necessarily differentiable, function in an Euclidean space. Using these results, we study the relationship between minimizing sequences and stationary sequences of the D-gap function, regardless of the existence of solutions of (VIP).     

Further explorations into ternary complementary pairs

In [R. Craigen, C. Koukouvinos, A theory of ternary complementary pairs, J. Combin. Theory Ser. A 96 (2001) 358-375], we proposed a systematic approach to the theory of ternary complementary pairs (TCPs) and showed how all pairs known then could be constructed using a single elementary product, the natural equivalence relations, and a handful of pairs which we called primitive. We also introduced more new primitive pairs than could be inferred previously, concluding with some conjectures reflecting the patterns that were beginning to arise in light of the new approach.In this paper we take what appears to be the natural next step, by investigating these patterns among those lengths and weights that are within easy computational distance from the last length considered therein, length 14. We give complete results up to length 21, and partial results up to length 28. (Ironically, although we proceed analytically by weight first then length, for computational reasons we are bound, in this empirical investigation, to proceed according to length first.)Thus we provide support for the previous conjectures, and shed enough new light to speculate further as to the likely ultimate shape of the theory. Since short term work on TCPs will require massive acquisition of data about small pairs, we also discuss affixes—a computational strategy that arose out of the investigations culminating in this article.     

Some σ-double sequence spaces defined by Orlicz function

In this paper we introduce some new double sequence spaces using the notions of invariant mean and Orlicz function. We also examine some properties of the resulting sequence spaces.     

The Vanishing of the Theta Function in the KP Direction: A Geometric Approach

We give a geometric proof of a formula, due to Segal and Wilson, which describes the order of vanishing of the Riemann theta function in the direction which corresponds to the direction of the tangent space of a Riemann surface at a marked point. While this formula appears in the work of Segal and Wilson as a by-product of some nontrivial constructions from the theory of integrable systems (loop groups, infinite-dimensional Grassmannians, tau functions, Schur polynomials, etc.) our proof only uses the classical theory of linear systems on Riemann surfaces.