首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 31 毫秒
1.
张德瑜  翟文广 《数学学报》2006,49(5):1181-118
令ρ3(n)=∑n=|m|3-|l|3,(m,l)=1 1.本文研究了和式R3(x)=∑n≤xρ3(n)= A3x2/3+B3x1/2+E3(x),并且在黎曼假设下,得到E3(x)=0(x4/15+ε),从而进一步改进了前人的结果.  相似文献   

2.
张德瑜  翟文广 《数学学报》2006,49(1):205-214
令δk(n)=max{d:dk|n},0相似文献   

3.
朱玉扬 《数学学报》2011,(4):669-676
本文研究如下一种场站设置问题:设S是欧空间E~m中由有限个点A_1,A_2,…,A_n组成的集合.d(A_i,A_j)表示点A_i和A_j之间的距离.令σ(S)=Σ_(1≤i相似文献   

4.
It is proved that a 4-connected, δ-regular graph G either is Hamiltonian, or has at least 3δ + 1 vertices and contains a cycle of length at least min{4δ - 4, 1/2 (|G| + 3δ - 2)}. Examples supplied by B. Jackson and H.A. Jung show that min{4δ - 4, 1/2(|G| + 3δ - 2)} cannot be replaced by 4δ + 1.  相似文献   

5.
关于正定厄米特矩阵的一个不等式的推广   总被引:2,自引:0,他引:2  
本文推广了正定厄米特矩阵的一个不等式 ,得到以下结果 :设 A( i) ,B( i) ,… ,C( i) ( i=1 ,2 ,… ,m)都是 n阶正定厄米特矩阵 ,A( i)11,B( i)11,… ,C( i)11为其相应矩阵的 k阶顺序主子阵 ,1≤ k≤ n-1 ,α,β,… ,γ都是正实数 ,且 α+β+… +γ=p≥ 1 ,则有∑mi=1|A( i) |α|A( i)11|α,|B( i) |β|B( i)11|β… |C( i) |γ|C( i)11|γ) <∑mi=1A( i) α∑mi=1A( i)11α.∑mi=1B( i) β∑mi=1B( i)11β…∑mi=1C( i) γ∑mi=1C( i)11γ  相似文献   

6.
A generalized balanced tournament design, GBTD(n, k), defined on a kn-set V, is an arrangement of the blocks of a (kn, k, k – 1)-BIBD defined on V into an n × (kn – 1) array such that (1) every element of V is contained in precisely one cell of each column, and (2) every element of V is contained in at most k cells of each row. Suppose we can partition the columns of a GBTD(n, k) into k + 1 sets B1, B2,..., Bk + 1 where |Bi| = n for i = 1, 2,..., k – 2, |Bi| = n–1 for i = k – 1, k and |Bk+1| = 1 such that (1) every element of V occurs precisely once in each row and column of Bi for i = 1, 2,..., k – 2, and (2) every element of V occurs precisely once in each row and column of Bi Bk+1 for i = k – 1 and i = k. Then the GBTD(n, k) is called partitioned and we denote the design by PGBTD(n, k). The spectrum of GBTD(n, 3) has been completely determined. In this paper, we determine the spectrum of PGBTD(n,3) with, at present, a fairly small number of exceptions for n. This result is then used to establish the existence of a class of Kirkman squares in diagonal form.  相似文献   

7.
设 Bn 表示所有的n 阶布尔矩阵的集合, R( A)表示 A∈ Bn 的行空间,| R( A)|表示 R( A)的基数.设m ,n,k 为正整数,本文证明了当n≥9, n+ 52 ≤k≤n- 3 时,对任意的 m ,2k≤m ≤2k+ 2n- k+ 2+ 2n- k+ 1 + …+ 23,存在 A∈ Bn,使得| R( A)|= m .  相似文献   

8.
Hamiltonian[k,k+1]-因子   总被引:4,自引:0,他引:4  
本文考虑n/2-临界图中Hamiltonian[k,k+1]-因子的存在性。Hamiltonian[k,k+1]-因子是指包含Hamiltonian圈的[k,k+1]-因子;给定阶数为n的简单图G,若δ(G)≥n/2而δ(G\e)相似文献   

9.
Let P(z) =n∑j=0 a_jz~j be a polynomial of degree n and let M(P, r) = max|z|=r|P(z)|. If P(z) ≠ 0 in |z| 1, then M( P, r) ≥ ((1 + r)/ (1 + ρ))~ n M( P, ρ).The result is best possible. In this paper we shall present a refinement of this result and some other related results.  相似文献   

10.
In this paper,the authors prove that the multilinear fractional integral operator T A 1,A 2 ,α and the relevant maximal operator M A 1,A 2 ,α with rough kernel are both bounded from L p (1 p ∞) to L q and from L p to L n/(n α),∞ with power weight,respectively,where T A 1,A 2 ,α (f)(x)=R n R m 1 (A 1 ;x,y)R m 2 (A 2 ;x,y) | x y | n α +m 1 +m 2 2 (x y) f (y)dy and M A 1,A 2 ,α (f)(x)=sup r0 1 r n α +m 1 +m 2 2 | x y | r 2 ∏ i=1 R m i (A i ;x,y)(x y) f (y) | dy,and 0 α n, ∈ L s (S n 1) (s ≥ 1) is a homogeneous function of degree zero in R n,A i is a function defined on R n and R m i (A i ;x,y) denotes the m i t h remainder of Taylor series of A i at x about y.More precisely,R m i (A i ;x,y)=A i (x) ∑ | γ | m i 1 γ ! D γ A i (y)(x y) r,where D γ (A i) ∈ BMO(R n) for | γ |=m i 1(m i 1),i=1,2.  相似文献   

11.
Let p(z)=a_0+a_1z+a_2z~2+a_3z~3+···+a_nz~n be a polynomial of degree n.Rivlin[12]proved that if p(z)≠0 in the unit disk,then for 0r≤1,max|z|=r|p(z)|≥((r+1)/2)~nmax|p(z)||z|=1.In this paper,we prove a sharpening and generalization of this result and show by means of examples that for some polynomials our result can significantly improve the bound obtained by the Rivlin’s Theorem.  相似文献   

12.
In this paper,we study the scattering and blow-up dichotomy result of the radial solution to nonlinear Schrodinger equation(NLS) with the combined terms iu_t+△u=-|u|~4u+|4|~(p-1)u,1+4/3p5 in energy space H~1(R~3).The threshold energy is the energy of the ground state W of the focusing,energy critical NLS,which means that the subcritical perturbation does not affect the determination of threshold,but affects the scattering and blow-up dichotomy result with subcritical threshold energy.This extends algebraic perturbation in a previous work of Miao,Xu and Zhao[Comm.Math.Phys.,318,767-808(2013)]to all mass supercritical,energy subcritical perturbation.  相似文献   

13.
This paper considers a fast diffusion equation with potential ut= um V (x)um+upin Rn×(0,T), where 1 2αm+n< m ≤ 1, p > 1, n ≥ 2, V (x) ~ω|x|2with ω≥ 0 as |x| →∞,and α is the positive root of αm(αm + n 2) ω = 0. The critical Fujita exponent was determined as pc= m +2αm+nin a previous paper of the authors. In the present paper,we establish the second critical exponent to identify the global and non-global solutions in their co-existence parameter region p > pcvia the critical decay rates of the initial data.With u0(x) ~ |x| aas |x| →∞, it is shown that the second critical exponent a =2p m,independent of the potential parameter ω, is quite different from the situation for the critical exponent pc.  相似文献   

14.
陈爱莲 《数学研究》2008,41(4):384-387
假设H和H(分别是具有h个顶点和n个顶点的r一致超图.我们称一个具有n/h个分支,且每个分支都同构于H的H的生成子图为H的一个H-因子.记α(H) = max{|E′|/|V′|-1 |},其中的最大值取遍H的所有满足|V’|〉1的子超图(V’,E′).δ(H)表示超图H的最小度.在本文中,我们证明了如果δ(H)〈α(H),那么P=p(n)=n-1/α(H)就是随机超图Hr(n,P)包含.H-因子的一个紧的门槛函数.也就是说,存在两个常数c和C使得对任意P=p(n)=cn-1/α(H),几乎所有的随机超图Hr(n,P)都不包含一个H-因子,对任意P=p(n)=cn-1/α(H),几乎所有的随机超图Hr(n,P)都包含一个H-因子.  相似文献   

15.
关于“一族特殊的星像函数”一文的补充   总被引:1,自引:0,他引:1  
吴卓人 《数学学报》1957,7(3):433-438
<正> 1.作者在前一文中证明了下面的结果:1°设 f(z)=z+a_z~2+…在单位圆|z|<1中满足条件(?)就是说 f(z)属于函数族 S,那末 f(z)的任何开始多项式σ_n(z)=z+…+a_nZ~n都在圆|z|<1/2中是单叶的.  相似文献   

16.
LetA andB be two proper subsets of n such thatA + B n .The Cauchy-Davenport Theorem states that|A + B| |A| + |B| – 1 for a primen. As mentioned by Cauchy the inequality may not hold for a compositen. Chowla generalized the Cauchy-Davenport as follows.Suppose 0 B andgcd(x, n) = 1 for allx B0, then|A + B| |A| + |B| – 1. We show that if 0 B and for allx, y B0 such thatx y gcd(x,y,n) = 1, then|A + B| |A| + |B| – 2. Moreover|A + B| |A| + |B| – 1 unless |B| = 2 or b B such thatB {0, b} is a union of cosets modulo the cyclic group generated byb.  相似文献   

17.
18.
《数学季刊》2017,(2):142-151
In this paper we introduce a new general subclass n,g ∑ a,λ(A, B,α) of univalent func-tions related the known integral operator and differential operator. Some majorization re-sults for n,g ∑ a,λ(A, B, 1) as well as the other functions are given. Furthermore, we find the coefficients bounds on|a2|and|a3|for functions in?n,g ∑ a,λ(A1, B1, A2, B2,α1,α2), which is the bi-univalent functions defined by n,g ∑ a,λ(A, B,α) and subordination. By giving specific values of the parameters of our main results, several(known or new) consequences of main results are also discussed.  相似文献   

19.
设F2为两个元素组成的有限域, F2n 为F2上的n维向量空间. 对于集合A, B ⊆ F2n , 它们的和集定义为所有两两互异的和a+b所组成的集合, 其中a∈A, b∈B. Green 和Tao 证明了: 设K > 1,如果A, B ? F2n 且|A + B|≤K|A|1/2|B|1/2, 则存在一个子空间H?F2n 满足
|H|>>exp(-O(√KlogK))|A|
以及x,y∈F2n, 使得
|A∩(x+H)|1/2|B∩(y+H)|1/2≥1/2K|H|.
本文我们将使用Green 和Tao 的方法并作一些修改, 证明如果|H|>>exp(-O(√K))|A|,
则以上的结论仍然成立.  相似文献   

20.
本文对两个加工可拒绝的无界批量分批排序问题1|B≥n,rej|∑ωjTj+TP和1|B≥n,rej|∑ωj+TP进行了研究,对这两个问题分别给出了伪多项式时间算法和(FPTAS)近似算法.目前为止它们都是比较好的精确算法和近似算法.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号