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1.
有限局部环Z/q~kZ上矩阵广义逆的几个计数结果   总被引:2,自引:1,他引:1  
设 R =Z/ qk Z是模整数 qk的有限局部环 ,其中 q是素数 ,k>1 .对 R上给定的 n阶矩阵 A,设 W1={X∈ Mn( R) |PAXP- 1=Q- 1XAQ, 1 P,Q∈ GLn( R) },W2 ={X∈ Mn( R) |AX =XA},W3={X∈ Mn( R) |AXA =A},W4 ={X∈ Mn( R) |XAX =X}.若 Wi≠Φ( i=1 ,2 ,3 ,4) ,用 n( Wi)表示 Wi中所有元素的个数 ,主要计算出 n( Wi) ( i =1 ,2 ,3 ,4)  相似文献   

2.
Let be the Galois ring of characteristic 23 and rank n and let . We give an explicit construction of Hadamard difference sets in .}Research supported by NSA grant MDA 904-02-1-0080.  相似文献   

3.
证明了一类n阶(n=P_1P_2…p_m,p_i(i=1,2,…,m)互异为素数)环是有限循环环,并讨论了他们的结构及相关性质,最后给出了这类n阶环有零因子或有子域的充要条件.主要结果:P_1P_2…P_m阶环共有2m个,它们是(p_(1m个,它们是(p_(1k_1) p_(2k_1) p_(2k_2)…p_(mk_2)…p_(mk_m)Z)/(p_(1k_m)Z)/(p_(1k_1+1)p_(2k_1+1)p_(2k_2+1)…p_(mk_2+1)…p_(mk_m+1)Z),其中k_i=0或1,1≤i≤m;阶是n=P_1P_2…p_m的环R可唯一分解为m个素数阶理想的直和,即R=〈α〉=(?);含pi(1≤i≤m)阶子域的P_1P_2…P_m阶环共有2k_m+1)Z),其中k_i=0或1,1≤i≤m;阶是n=P_1P_2…p_m的环R可唯一分解为m个素数阶理想的直和,即R=〈α〉=(?);含pi(1≤i≤m)阶子域的P_1P_2…P_m阶环共有2(m-1)个,它们是p_(1(m-1)个,它们是p_(1k_1) p_(2k_1) p_(2k_2)…p_(mk_2)…p_(mk_m)Z)/(p_(1k_m)Z)/(p_(1k_1+1)p_(2k_1+1)p_(2k_2+1)…p_(mk_2+1)…p_(mk_m+1)Z),其.中k_i=0,k_j=0或1,1≤j≤m,j≠i.  相似文献   

4.
Gong Z,Aldeen M和Elsner L在[A note on a generalized Cramer’s rule,Linear AlgebraApp.,2002,340:253-254]中给出结论:对任意的k,α∈Qk,n,β∈Qk,m有|Xα,β|=|A-1|AYαβ,其中A∈n×n可逆矩阵,AX=Y.本文给出交换环上Rao正则矩阵的广义Cramer法则.  相似文献   

5.
We establish the non-existence of a maximal set of four mols (mutually orthogonal Latin squares) of order 8 and the non-existence of (8, 5) projective Hjelmslev planes. We present a maximal set of four mols of order 9.  相似文献   

6.
The boundary behavior of the Bergman kernel function of a kind of Reinhardt domain is studied. Upper and lower bounds for the Bergman kernel function are found at the diagonal points (Z,(Z-)). Let Ω be the Reinhardt domainm(X) where αj>0,j=1,2,…,n,N=N1+N2+…+Nn,‖Zj‖ is the standard Euclidean norm in CNj,j=1,2,…,n; and let K(Z,(W-)) be the Bergman kernel function of Ω. Then there exist two positive constants m and M,and a function F such that mF(Z,(Z-))≤K(Z,(Z-))≤MF(Z,(Z-))holds for every Z∈Ω. Here (X) and r(Z)=‖Z‖α-1 is the defining function of Ω. The constants m and M depend only on α=(α1,…,αn) and N1,N2,…,Nn,not on Z. This result extends some previous known results.  相似文献   

7.
岭回归中确定K值的一种方法   总被引:7,自引:0,他引:7  
本文给出了岭估计中确定K值的一种新方法,这种方法改进了Hoerl和Kennard的相应方法。  相似文献   

8.

We study the second-order difference equation x n +1 = f ( x n ) x n m 1 where f ] C 1 ([0, X ),[0, X )) and x n ] (0, X ) for all n ] Z . For the cases p h 5, we find necessary and sufficient conditions on f for all solutions to be periodic with period p . We answer some questions and conjectures of Kulenovi ' and Ladas.  相似文献   

9.
本文得到了一类环上矩阵Drazin逆的一个定理:设N表有单位元环R中零元、可逆元集合与R的中心Z(R)的交集,M表R的子域与Z(R)的交集,A∈Rn×n.若f(λ)=cλk(1-λq(λ))是A的化零多项式,其中q(λ)的系数属于N,且c∈N,则A的Drazin逆存在,且X=Ak[q(A)]k+1是A的唯一的一个Drazin逆.  相似文献   

10.
连德忠 《数学研究》2012,(4):390-403
确立了某类分块矩阵[M(11) M12 XM21 Y M23Z M32 M33]的最大秩公式,其中,X,Y和Z是三个受限于四元数线性矩阵方程A1X=C1,XB1=C2,A2Y=D1,YB2=D2,A3Z=E1,ZB3=E2的变量矩阵.作为该公式的一项应用,我们推导出上述矩阵方程解集等同于某类四元数三次矩阵方程组A1X=C1,XB1=C2,A2Y=D1,YB2=D2,A3Z=E1,ZB3=E2,XYZ=J解集的条件.  相似文献   

11.
引入强3-Armendariz环的概念,研究了它们的性质。给出环R是强3-Armendariz环的充要条件。构造了是强3-Armendariz环但不是幂级数Armendariz环的例子。证明了若环R是约化环,则R[X]/(xn)是强3-Armendariz环,其中(xn)是由xn生成的R[x]的理想。  相似文献   

12.
Let s q denote the q-ary sum-of-digits function and let \({P_1(X), P_2(X) \in \mathbb{Z}[X]}\) with \({P_1(\mathbb{N}), P_2(\mathbb{N}) \subset \mathbb{N}}\) be polynomials of degree \({h, l \geqq 1, h \neq l}\) , respectively. In this note we show that ( \({s_q(P_1(n))/s_q(P_2(n)))_{n \geqq 1}}\) is dense in \({\mathbb{R}^+}\) . This extends work by Stolarsky [9] and Hare, Laishram and Stoll [6].  相似文献   

13.
Let ε:y2 =x3 + Ax + B be an elliptic curve defined over the finite field Zp(p > 3)and G be a rational point of prime order N on ε.Define a subset of ZN,the residue class ring modulo N,as S ∶={n ∶n ∈ZN,...  相似文献   

14.
15.
From     
Let be a space of finite type. Set as usual, and define the mod support of by for 0.$"> Call sparse if there is no with

Then we show the relation for any finite type space with being sparse.

As a special case, we have and the main theorem of Ravenel, Wilson and Yagita is also generalized in terms of the mod support.

  相似文献   


16.
设1〈P≤2,0〈n≤1,X是P一致可光滑空间的Banach空间,则对每个X值拟鞅f=(fn)n≥0∈pHn^σ(X)存在分解fn=∑k∈Zμkαn^k(n≥0),并且||f||pHα^σ(X)+||R(f)||α~inf(∑k∈μk^a)^1/a,这里a^k=(an^k)n≥(k∈Z)是一列(1,α,∞;p)拟鞅原子,并且在L^1中收敛,sup k∈z||a^k*||n〈∞,(μk)k∈Z∈la是非负实数列.对于拟鞅空间pHa^s(X)和qKn(x)成立类似的结果.此外,利用拟鞅原子分解定理,证明了几个拟鞅不等式.  相似文献   

17.
18.
设k_(ij)(1≤ij≤n)是给定的正整数,分别记G={ (1 k12a12…k1na1n 0 1…k2na2n…… 0 0…1 )|aij∈Z},R={ (0 k12a12…k1na1n……0 0…k2na2n 0 0…1 )|aij∈Z},本文证明:当G成群且G的上、下中心群列重合时,其相伴Lie环L(G)与Lie环R同构,其中R的Lie积定义为[A,B]=AB-BA.即得到了此时L(G)的矩阵表示.  相似文献   

19.
线性流形上双对称阵逆特征值问题   总被引:17,自引:0,他引:17  
张磊  谢冬秀  胡锡 《计算数学》2000,22(2):129-138
1.引言 令R表示所有n×m阶实对称阵集合,R=R,R表示R中秩为r的子集; OR是n阶正交阵之集; A+表示A的Moors-penrose广义逆;Ik表示k阶单位阵; SR表示 n×n表示n阶实对称阵的全体; R(A)表示 A的列空间; N(A)表示 A的零空间; rank(A)表示 A的秩,对 A=(aij), B=(bij) R, A* B表示 A与 B的 Hadamard乘积,其定义为 A* B=(aij bij),并且定义 A与 B的内积为(A,B)=t,(BA),由此内积导出的范数为(A,A)=(t,(A…  相似文献   

20.

We investigate the asymptotic behavior of solutions of the system x ( n +1)=[ A + B ( n ) V ( n )+ R ( n )] x ( n ), n S n 0 , where A is an invertible m 2 m matrix with real eigenvalues, B ( n )= ~ j =1 r B j e i u j n , u j are real and u j p ~ (1+2 M ) for any M ] Z , B j are constant m 2 m matrices, the matrix V ( n ) satisfies V ( n ) M 0 as n M X , ~ n =0 X Á V ( n +1) m V ( n ) Á < X , ~ n =0 X Á V ( n ) Á 2 < X , and ~ n =0 X Á R ( n ) Á < X . If AV ( n )= V ( n ) A , then we show that the original system is asymptotically equivalent to a system x ( n +1)=[ A + B 0 V ( n )+ R 1 ( n )] x ( n ), where B 0 is a constant matrix and ~ n =0 X Á R 1 ( n ) Á < X . From this, it is possible to deduce the asymptotic behavior of solutions as n M X . We illustrate our method by investigating the asymptotic behavior of solutions of x 1 ( n +2) m 2(cos f 1 ) x 1 ( n +1)+ x 1 ( n )+ a sin n f n g x 2 ( n )=0 x 2 ( n +2) m 2(cos f 2 ) x 2 ( n +1)+ x 2 ( n )+ b sin n f n g x 1 ( n )=0 , where 0< f 1 , f 2 < ~ , 1/2< g h 1, f 1 p f 2 , and 0< f <2 ~ .  相似文献   

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