On Weakly P.P. Rings

We introduce, in this paper, the right weakly p.p. rings as the generalization of right p.p. rings. It is shown that many properties of the right p.p. rings can be extended onto the right weakly p.p. rings. Relative examples are constructed. As applications, we also characterize the regular rings and the semisimple rings in terms of the right weakly p.p. rings.     

一个不等式的进一步推广和加强

利用幂级数展式和凸函数的性质把关于一个不等式的推广和强化的两个最新结果推广到更加一般的情形p(p -1 ) d ap- 1pn+1-ap- 1pm <∑nk=m1a1pk相似文献   

Self-maps of p-local infinite projective spaces

Denote by Z (p) (resp.Z p ) the p localization (resp.p completion) of Z.Then we have the canonical inclusion Z (p) → Z p .Let S 2n-1 (p) be the p-local (2n-1)-sphere and let B 2n (p) be a connected p-local space satisfying S 2n-1 (p) ～= ΩB 2n (p) ;then H - (B 2n (p) ,Z (p) ) = Z (p) [u] with |u| = 2n.Define the degree of a self-map f of B 2n (p) to be k ∈ Z (p) such that f *(u) = ku.Using the theory of integer-valued polynomials we show that there exists a self-map of B 2n (p) of degree k if and only if k is an n-th power in Z p .     

Resonance Problems for Hardy-Sobolev Operator

We consider the resonance problems for Hardy-Sobolev operator L w u := m j p u m w /(| x | p )| u | p m 2 u , 0 h w < (( N m p ) p ) p / at an arbitrary eigen value. Here j p is the usual p -Laplacean. We prove the existence of weak solutions assuming a standard Landesman-Lazer condition.     

Majorization versus power majorization

, . , [1]. 42.     

Generalization of some results concerning Walsh series and the dyadic derivative

, , , . , . , , x(0,1),x2^–j ,j=1,2,..., 2 ⁿ . , ka _k 0 k k. , (0, 1) , , , , . , .     

关于Hardy不等式的加强改进

对 Hardy不等式 ,建立如下结构的加强不等式 :∑∞n=11n∑nk=1akp 1 ,an≥ 0 (n∈ N) ,0 <∑∞n=1apn<∞ ,Cp=1 -(1 -p- 1) p- 1,p≥ 2 ;1 -p- 1,1 相似文献   

椭圆曲线y2=2px(x2+1)上正整数点的个数

设p是奇素数,N(p)是椭圆曲线E:y2=2px(x2+1)的正整数点(x,y)的个数.主要讨论了N(p)的性质,运用初等方法及四次Diophantine方程的性质,对某些特殊素数p,给出了N(p)的上界.证明了当p≡1(mod 8)且p=s2+32t,其中s,t是正整数时,N(p)≤3;当p≡1(mod 8)且p+s...     

p.n.p.矩阵的一些性质

一个n阶实方阵若其各阶主子式皆非正,则称为部分非正阵,简写作p.n.p.矩阵.特别地,各阶主子式皆负的p.n.p.矩阵称为部分负矩阵,简写为p.n.矩阵。文[1]、[5]讨论了p.n.p.矩阵的谱性质。本文在[5]的基础上讨论了p.n.p.矩阵的若干性质,并给出p.n.p.矩阵特征值的某些估计式。 引理1 设A=(A_(ij)_n×n为一p.n.p.矩阵,则A的特征值之实部不全为负(n≥2)。 证 设λ_1,λ_2,…,λ_n为A的全部特征值。假定A的每一特征值之实部皆为负。分两种情     

On equiaffine planes

In an equiaffine plane of characteristic 2, let denote the group generated by the affine reflections with axes in a parallel pencil . The centre of is the group of the translations in the direction , and the quotient group is isomorphic to the group generated by the affine reflections in the direction . Let * . Then is the product of at most two affine reflections unless is a glide reflection in which case three affine reflections are needed. In general, the affine reflections may be required to belong to . We also show that the equiaffine group of is the commutator subgroup of the affine group.This paper contains the results of the author's doctoral dissertation submitted to the University of Toronto and written under the supervision of Professor Peter Scherk.     

Integrability of double trigonometric series with special coefficients

- , , . , L ¹=L ¹([0, ]×]0, ]). , ; , L ¹ , - . . . . 1976 ., ; 1989 .

---

---

The basic part of this research was done while the author was a visiting professor at the Syracuse University, U.S.A., during the academic year 1986/87.     

与年龄相关的半线性时变种群系统的最优捕获

本文讨论了如下的一类与年龄相关的半线性时变种群系统 : p t+ p r+μ( r,t) p +Φ( N ( t) ) p =-v( r,t) p,p( 0 ,t) =∫A0 m( r,t) p( r,t) dr,p( r,0 ) =p0 ( r) ,N ( t) =∫A0 p( r,t) dr,其中 p( r,t)为时刻 t年龄为 r的单种群年龄密度函数 ,v( r,t)为捕获策略 .主要利用泛函分析中的 Mazur定理和分离的思想 ,证明了状态方程解的存在唯一性 ,并论证了对于给定的目标泛函 ,在一定条件下最优捕获控制的存在性 .     

On Sharpening of a Theorem of Ankeny and Rivlin

Let $p(z)=\sum^n_{v=0}a_vz^v$be a polynomial of degree $n$, $M(p,R)=:\underset{|z|=R\geq 0}{\max}|p(z)|$ and $M(p,1)=:||p||$.Then according to a well-known result of Ankeny and Rivlin [1], we have for $R\geq 1$, $$M(p,R)\leq (\frac{R^n+1}{2})||p||.$$This inequality has been sharpened by Govil [4], who proved that for $R\geq 1$, $$M(p,R)\leq (\frac{R^n+1}{2})||p||-\frac{n}{2}(\frac{||p||^2-4|a_n|^2}{||p||})\left\{\frac{(R-1||p||)}{||p||+2|a_n|}-ln(1+\frac{(R-1)||p||}{||p||+2|a_n|})\right\}.$$In this paper, we sharpen the above inequality of Govil [4], which in turn sharpens the inequality of Ankeny and Rivlin [1].     

关于调和数的一个结论

设n是大于1的正常数,并且设n=pα11p2α2…ptαt,其中pi为素数,i=1,2,…,t,ω(n)表示n的不同素因子的个数,即ω(n)=t.若n的所有因子的倒数和为整数,即0≤∑ij≤αjj=1,2,…,t1p1i1pi22…ptit为整数,称n是调和数.证明了和调和数相关的一个结论.     

产品检验中的抽样个数

设某批产品 (总体 )的次品率为 p,对总体提出假设H0 :p≤ p0 ,　 H1:p >p1其中 0 相似文献   

关于Fuzzy度量点式刻画的一点注记

本文中重新定义由一个点式Ｆｕｚｚｙｐ．ｑ．度量ｄ所诱导的Ｆｕｚｚｙｐ．ｑ．度量｛Ｄｒ｜ｒ＞０｝（代替［１］中的相关重域映射族）．在新的定义下，点式Ｆｕｚｚｙｐ．ｑ．（ｐ．）度量与Ｆｕｚｚｙｐ．ｐ．（ｐ．）度量之间有令人满意的──对应关系．     

单圈图H(p,tK_{1,m})的Laplacian谱刻画

设图\,$H(p,tK_{1,m})$\,是一个顶点数为\,$p+mt$\,的连通单圈图,它是由圈\,$C_{p}$\,的依次相邻的\,$t(1\leq t\leq p)$\,个顶点、每一个顶点分别与星\,$K_{1,m}$\,的中心重合而得到的单圈图. 证明了单圈图\,$ H( p,p K_{1,4})$, $H(p,p K_{1,3})$, $H(p,(p-1)K_{1,3})$\,是由它们的\,Laplacian\,谱确定的,并证明了当\,$p$\,为偶数时,单圈图\,$H(p,$2K_{1,3})$, $H( p,(p-2) K_{1,3})$, $H(p,(p-3)K_{1,3})$\,也是由它们的\,Laplacian\,谱确定的.     

Largek-arcs in inversive planes of odd order

An infinite family of largek-arcs in the inversive plane over a finite field GF(q), withq 1 (mod 3),q71 orq {17,23, 27,29,41,47,49,53,59} is constructed.Research supported by G.N.S.A.G.A. of C.N.R., project Applicazioni della matematica per la tecnologia e la società, subproject Calcolo simbolico.     

Sobolev inequalities on homogeneous spaces

We consider a homogeneous spaceX=(X, d, m) of dimension 1 and a local regular Dirichlet forma inL ² (X, m). We prove that if a Poincaré inequality of exponent 1p< holds on every pseudo-ballB(x, R) ofX, then Sobolev and Nash inequalities of any exponentq[p, ), as well as Poincaré inequalities of any exponentq[p, +), also hold onB(x, R).Lavoro eseguito nell'ambito del Contratto CNR Strutture variazionali irregolari.     

Hausdorff operators on the Heisenberg group

This paper is devoted to the high-dimensional and multilinear Hausdorff operators on the Heisenberg group H n. The sharp bounds for the strong type(p, p)(1 ≤ p ≤∞) estimates of n-dimensional Hausdorff operators on H n are obtained. The sharp bounds for strong(p, p) estimates are further extended to multilinear cases. As an application, we derive the sharp constant for the multilinear Hardy operator on H n. The weak type(p, p)(1 ≤ p ≤∞) estimates are also obtained.