有穷等差数列的中间项

引理 在等差数列{an}中,若p＋q=r＋s,则ap＋aq=ar＋as． 特别地,当p＋q=2m时,有ap＋aq=2am．     

等差数列中一条性质的推广

我们知道在等差数列{an}中有这样一条性质：若m＋n=p＋q,则am＋an=ap＋aq（m,n,p,q均为正整数）．这条性质有着很广泛的应用．     

等差数列、等比数列的一个新的性质

结论1已知等差数列{an},r,s,t是互不相等的正整数,则有(r-s)at (s-t)ar (t-r)as=0.证明设等差数列{an}的首项为a1,公差为d,则(r-s)at (s-t)ar (t-r)as=(r-s)[a1 (t-1)d] (s-t)[a1 (r-1)d] (t-r)[a1 (s-1)d]=[(r-s) (s-t) (t-r)]a1 [(r-s)(t-1) (s-t)(r-1) (t-r)(s-1)]d=[(r-s) (s-t) (t-r)]a1 [(rt-st-r s) (sr-tr-s t) (ts-rs-t r)]d=0.此结论可以在知道等差数列中的任意两项的情况下,求出第三项的值.比如问题:已知数列{an}为等差数列,ap=q,aq=p,且p≠q,求ap q.略解由结论1可知,(p-q)ap q [q-(p q)]ap [(p q)-p]aq=0,即(p-q)ap q-pq pq=0,…     

等差（等比）数列中的相等问题

我们知道 ,非零的常数列既是等差数列 ,又是等比数列 .在这类数列中 ,对于任意自然数 p ,q ,都有ap=aq.除此之外 ,还有没有其它等差 (等比 )数列使ap=aq 成立 ?Sp =Sq的情况又如何 ?本文将对这些问题进行探讨 .1　等差数列中的相等问题设 {an}是等差数列 (非常数列 ,下同 ) ,是否存在自然数 p ,q ( p≠q) ,使ap =aq,Sp=Sq?分析　若ap=aq,则由等差数列的通项公式有a1+ ( p - 1 )d =a1+ ( q - 1 )d .因为 {an}不是常数列 ,即公差d≠ 0 ,所以 ,必有 p =q .这与 p≠q的条件相矛盾 .这样 ,我们就得出第一个结论 :对于非常数列的数差数列 ,它的…     

A NON-TRIVIAL PRODUCT OF FILTRATION s＋6 IN THE STABLE HOMOTOPY GROUPS OF SPHERES

By a method improving that of [1], the authors prove the existence of a non-trivial product of filtration, s ＋ 6, in the stable homotopy groups of sphere, πt-6S, which is represented up to non-zero scalar by β^-s＋2ho（hmbn-1 -hnbm-1） ∈ ExtA^s＋6,t＋s（Zp, Zp） in the Adams spectral sequence, where p ≥ 7, n ≥ m ＋ 2 ≥ 5, q = 2（p- 1）, 0 ≤ s 〈 p - 2, t= （s ＋ 2 ＋ （s ＋ 2）p ＋ p^m ＋ p^n）q. The advantage of this method is to extend the range of s without much complicated argument as in [1].     

SOME NEW FAMILIES OF FILTRATION FIVE IN THE STABLE HOMOTOPY OF SPHERES

This study proves a general result on convergence of α2x ∈ ExtA^s＋2.tq＋2q＋1 （Zp, Zp） in the Adams spectral sequence and as a consequence, the study detects some new families in the stable homotopy groups of spheres πtq＋2q-4S which is represented in the Adams spectral sequence by α2fn,α2fn,α2huhmhn ∈ ExtA^5,tq＋2q＋1（Zp,Zp） with tq=p^n＋1q＋2p^nq,2p^n＋1q_P^nq,p^uq＋p^mq＋p^nq,respectively, where α2∈Extα^2,2q＋1（Zp,Zp）,fn∈ExtA^3,p^n＋1q＋2p^nq（Zp,Zp）,fn∈ExtA^3,2p^n＋2q＋p^nq（Zp,Zp）,hn∈ExtA^1,p^nq（Zp,Zp）and p≥5 is a prime,q=2（p=-1）,n≥2.     

综合题新编选登

题197 设a1=1，an＋1=2an＋n＋1． （Ⅰ）是否存在常数p，q使{an＋qn＋q}为等比数列？若存在，求出p，q的值，若不存在，说明理由：     

More large sets of resolvable MTS and DTS with even orders

In this paper, we first introduce a special structure that allows us to construct a large set of resolvable Mendelsohn triple systems of orders 2q ＋ 2, or LRMTS（2q ＋ 2）, where q = 6t ＋ 5 is a prime power. Using a computer, we find examples of such structure for t C T = {0, 1, 2, 3, 4, 6, 7, 8, 9, 14, 16, 18, 20, 22, 24}. Furthermore, by a method we introduced in [13], large set of resolvable directed triple systems with the same orders are obtained too. Finally, by the tripling construction and product construction for LRMTS and LRDTS introduced in [2, 20, 21], and by the new results for LR-design in [8], we obtain the existence for LRMTS（v）and LRDTS（v）, where v = 12（t ＋ 1） mi≥0（2.7mi＋1）mi≥0（2.13ni＋1）and t∈T,which provides more infinite family for LRMTS and LRDTS of even orders.     

On the generalization of the D. H. Lehmer problem

Let n ≥ 2 be a fixed positive integer, q ≥ 3 and c be two integers with （n, q） = （c, q） = 1. We denote by rn（51, 52, C; q） （δ 〈 δ1,δ2≤ 1） the number of all pairs of integers a, b satisfying ab ≡ c（mod q）, 1 〈 a ≤δ1q, 1 ≤ b≤δ2q, （a,q） = （b,q） = 1 and nt（a＋b）. The main purpose of this paper is to study the asymptotic properties of rn （δ1, δ2, c; q）, and give a sharp asymptotic formula for it.     

区传递的$2-(v, k, 1)$ 设计与单群$E_6(q)$

This article is a contribution to the study of block-transitive automorphism groups of 2-（v,k,1） block designs. Let D be a 2-（v,k,1） design admitting a block-transitive, pointprimitive but not flag-transitive automorphism group G. Let kr = （k,v-1） and q = pf for prime p. In this paper we prove that if G and D are as above and q （3（krk-kr ＋ 1）f）1/3, then G does not admit a simple group E6（q） as its socle.     

A NEW FAMILY OF FILTRATION S ＋ 5 IN THE STABLE HOMOTOPY GROUPS OF SPHERES

In this article, by the algebraic method, the author proves the existence of a new nontrivial family of filtration s ＋ 5 in the stable homotopy groups of spheres πrS,which is represented by 0 ≠γ^-s＋3hnhm∈Ext^s＋5,A ^t（Zp,Zp）in the Adams spectral sequence,where r=q（p^m＋p^n＋（s＋3）p^2＋（s＋2）p＋（s＋1））-5,t=p^mq＋p^nq＋（s＋3）p^2q＋（s＋2）pq＋（s＋1）q＋s,p≥7,m≥n＋2〉5,0≤s〈p-3,q=2（p-1）.     

让探索成为数学课堂教学的主线

有一天 ,王萍、傅丽丽两位同学来到我的办公室 ,请我给她们做一次“裁判”.事情的起因源于一道习题 :在等比数列 {an}中 ,已知 a2 =2 ,a6=8,求 a4.王萍同学解法是 :设公比为 q,∵　 a6=a2 q4,　∴　 q4=4 ,得 q2 =2 ,∴　 a4=a2 q2 =4 .而傅丽丽同学则是这样解的 :由等比数列性质可知 a2 ,a4,a6成等比 ,故 a24=a2 a6=1 6 ,　∴　 a4=± 4 .两位同学都确信自己的解法没错 ,而结果却不一致 ,但又不能指出对方的解法错在何处 ,于是想到请我这个老师帮忙“指点迷津”.我对两位同学善于探索、敢于提问的精神表示赞许之后 ,并不急于向她们亮出“谜…     

May谱序列中的一个非平凡积

In this paper,we prove the non-triviality of the product h 0 k o δ s＋4 ∈ Ext s＋6,t（s） A （Z p ,Z p ） in the classical Adams spectral sequence,where p ≥ 11,0 ≤ s p-4,t（s） = （s ＋ 4）p 3 q ＋ （s ＋ 3）p 2 q ＋ （s ＋ 4）pq ＋ （s ＋ 3）q ＋ s with q = 2（p-1）.The elementary method of proof is by explicit combinatorial analysis of the （modified） May spectral sequence.     

逼近转化论与泛系逼近论

Domain D∈S_m(r,θ)means D(?)R~m, and contains certain cone with radius r and m solid angle θ issued from every point of D. Theorem Ⅰ If D∈S_m(r, θ), f∈C(D), ω(δ, f. W_∞~((0))(D))≤λδ~a, (λ~(-1)‖f‖_p)~a≤r, then for 1≤p≤q≤∞, we have ‖f‖_q≤cλ~b‖f‖_p~d, where a=p/(pa m),b=me/(ap m),d=pa p/q,c=(max[(m/θ)~(1/p),m/(m a)])~e,e=1-p/q.     

On the Convergence of Products γ^-sh1hn in the Adams Spectral Sequence

Abstract Let A be the mod p Steenrod algebra and S the sphere spectrum localized at p, where p is an odd prime. In 2001 Lin detected a new family in the stable homotopy of spheres which is represented by （b0hn-h1bn-1）∈ ExtA^3,（p^n＋p）q（Zp,Zp） in the Adams spectral sequence. At the same time, he proved that i.（hlhn） ∈ExtA^2,（p^n＋P）q（H^＊M, Zp） is a permanent cycle in the Adams spectral sequence and converges to a nontrivial element ξn∈π（p^n＋p）q-2M. In this paper, with Lin＇s results, we make use of the Adams spectral sequence and the May spectral sequence to detect a new nontrivial family of homotopy elements jj′j^-γsi^-i′ξn in the stable homotopy groups of spheres. The new one is of degree p^nq ＋ sp^2q ＋ spq ＋ （s - 2）q ＋ s - 6 and is represented up to a nonzero scalar by hlhnγ-s in the E2^s＋2,＊-term of the Adams spectral sequence, where p ≥ 7, q = 2（p - 1）, n ≥ 4 and 3 ≤ s 〈 p.     

关于正项等比数列方幂的不等式

文[1 ]给出了正项等差数列方幂的若干不等式,本文将建立正项等比数列方幂一些类似的不等式.为简便起见,以下约定数列{an}是正项等比数列,公比为q (q >0 ) ,前n项和为Sn,m ,p ,n ,k均为正整数,且m

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高阶混合中立型微分方程的振动性质（英文）

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Dynamics of a Rational Difference Equation

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