Some Results on Finery Matrices

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Some New Results on Circulant Weighing Matrices

We obtain a few structural theorems for circulant weighing matrices whose weight is the square of a prime number. Our results provide new schemes to search for these objects. We also establish the existence status of several previously open cases of circulant weighing matrices. More specifically we show their nonexistence for the parameter pairs (n, k) (here n is the order of the matrix and k its weight) = (147, 49), (125, 25), (200, 25), (55, 25), (95, 25), (133, 49), (195, 25), (11 w, 121) for w < 62.     

Some Results on Correlation Matrices for Interest Rates

In this paper we systematize and develop some theoretical results about shift, slope and curvature for correlations matrices of interest rates. We provide a general investigation on the relations among some standard features of correlation models for interest rates and the existence of shift, slope and curvature. Our results show how their presence, excluding some peculiar behavior strictly related to low dimensions, can not be directly connected to the usual assumptions on the interest rates correlations structure. We provide some estimates of the distance between a shift and the vector, named pure shift, having all entries equal. We prove also that in a two-factor framework shift and slope are sufficient to justify the usual properties of correlations between rates.     

Some Results on Generalized Inverse of Intuitionistic Fuzzy Matrices

In this paper, pseudo-similar intuitionistic fuzzy matrix (IFM) is defined with some properties of pseudo-similar and semi-similar IFMs studied. Here it is shown that, the pseudo-similarity relation preserve idempotency and regularity for the IFMs. After characterizations of symmetric IFM are discussed, it is shown that symmetric and idempotent IFMs possess symmetric Moore–Penrose inverse. Some results are investigated regarding the group inverse of IFMs.     

关于布尔矩阵行空间基数的若干存在区间

Let B_n be the set of all n×n Boolean Matrices;R(A) denote the row space of A∈B_n,|R(A)| denote the cardinality of R(A),m,n,k,l,t,i,γ_i be positive integers,S_i,λ_i be non negative integers.In this paper,we prove the following two results: (1)Let n≥13,n-3≥k > S_l,S_(i+1)> S_i,i = 1,2,…,l-1.if k+l≤n,then for any m=2~k+2~(S_(l)) + 2~(S_(l-1))+…+ 2~(S_(1)),there exists A∈B_n,such that |R(A)|= m. (2)Let n≥13,n-3≥k>S_(n-k-1)> S_(n-k-2)>…>S_1>λ_t>λ_(t-1)>…>λ_1,2≤t≤n-k.If existγ_i(k+1≤γ_i≤n-1,i=1,2,…,t-1)γ_i<γ_...     

幂零Fuzzy矩阵的一些结论及幂零度的求法

本文给出计算幂零Fuzzy矩阵的幂零度的两个办法,同时给出一个有有向Hamilton路的有向图的一个充分条件.     

某些分块矩阵的逆矩阵

本文研究了某些 3× 3分块矩阵的可逆性条件 ,并给出了可逆时的求逆公式     

关于中心对称矩阵的几个性质

利用中心对称矩阵定义及翻转矩阵Vn等技巧,给出中心对称矩阵的一些性质和O≠X∈Cn与VnX同为中心对称矩阵对应于同一特征值的特征向量等结论.     

关于布尔矩阵半群和非负矩阵半群的几点注记

本文重点讨论了布尔矩阵半群中的幂等、广义幂等、素矩阵以及它们之间的联系，对非负矩阵半群上的类零型结构也进行了研究．     

关于完全正矩阵的几点注记(英文)

本文给出了一个 n×n非负、对称、弱对角占优矩阵 A为完全正的一个充分条件 .我们还给出了较好的算法 ,用以获得关于矩阵 A(当 A为完全正时 )的分解指数的一个上界 .     

循环矩阵的一些性质

本文给出了循环矩阵的一些性质.     

New Results on D‐Optimal Matrices

We construct a number of new supplementary difference sets (SDS) with v odd and . In particular, these give rise to D‐optimal matrices of the four new orders 206, 242, 262, 482, constructed here for the first time.     

关于矩阵秩的几点注记

研究了任意数域上两个相乘可交换方阵的幂的乘积的秩,推广了一个熟知的关于方阵幂的秩的结果.     

关于反中心对称矩阵的某些性质探讨

利用反中心对称矩阵的定义以及翻转矩阵等技巧,给出了反中心对称矩阵的伴随矩阵、特征值及特征向量的一些新结论.     

非负矩阵的一些算法

本文利用有限图论和齐次有限马尔可夫链理论的有关命题和算法得到了不同于[1]、[3]的算法:(1)有限阶非负矩阵可约性的判别、有限阶可约矩阵化为主对角线上都为不可约子块的分块三角阵的算法;(2)有限阶不可约矩阵的Frobenius表示的算法.对上述二算法本文还分别给出了直观简便的图示法.     

Some Results on Pseudosquares

If is an odd prime, the pseudosquare is defined to be the least positive nonsquare integer such that and the Legendre symbol for all odd primes . In this paper we first discuss the connection between pseudosquares and primality testing. We then describe a new numerical sieving device which was used to extend the table of known pseudosquares up to . We also present several numerical results concerning the growth rate of the pseudosquares, results which so far confirm that , an inequality that must hold under the extended Riemann Hypothesis.

     

复正定矩阵的行列式不等式

本文指出了文献[3-6]中的一些不正确的结论,并给出了复正定矩阵的行列式不等式.     

Additional Results on Convergence of Alternating Iterations Involving Rectangular Matrices

Different classes of matrix splittings of semi-monotone matrices lead to many comparison results, which are useful tools in examining the convergence rate of iterative methods for solving rectangular systems of linear equations in a faster way. In this context, the theory of alternating iterations for rectangular matrices was introduced recently, in order to arrive at the desired solution of accuracy or at the exact solution. In this article, we expand convergence theory of such alternating iterations and obtain comparison results for such iterations.     

Some Results on Fixed Pionts

In this paper, we first show several fixed point and or common fixed point theorems for point-valued and set-valued contractive type mappings in compact metric spaces, which satisfy very general contractive condition with strict inequality and may be discontinuous. Our theorems improve and generalize some main results in [1—4]. In the next place, we provide some new results for quite general orbitally contraction and quasi-contraction mappings. They improve, unify and extend some important results in [7-15].