一个素数和一个素数的平方和问题

H表示一个正整数N的集合,使对任意的正整数q,同余方程a+b~2≡N(mod q)在模q的既约剩余系中有解a;b.E(x)表示N≤x,N∈H,但不能表成p_1+p_2~2=N的数的个数,其中p_1,p_2个表示素数,则E(x)<相似文献   

一类超椭圆方程的整数解

设ｍ，ｎ∈Ｎ；ｍ≥２，ｎ≥２，ｍｎ≥６，ｆ（ｘ）＝ｘｍ＋ａ１ｘｍ－１＋…＋ａｍ∈Ｚ［ｘ］，Ｈ＝ｍａｘ（｜ａ１｜，…，｜ａｍ｜）．本文运用组合分析方法证明了：当ｍ≡０（ｍｏｄｎ），ａ１，…，ａｍ不全为零，而且其中第一个非零系数ａｓ与ｎ互素时，方程ｆ（ｘ）＝ｙｎ，ｘ，ｙ∈Ｚ，仅有有限多组解（ｘ，ｙ），而且这些解都满足｜ｘ｜＜（４ｍＨ）２ｍ／ｎ＋１以及｜ｙ｜＜（４ｍＨ）４ｍ２／ｎ２＋ｍ／ｎ＋１     

Die Automorphismengruppe Der Ebenen Reellen Polynomgeometrie

Let (?²,?[x]) denote the incidence structure consisting of the point set ?² and the set {{(x, f(x)) ¦ x ∈ ?} ¦ f ∈ ?[x]} of blocks. It will be shown, that every automorphism of this geometry has the form (x, y) ? (ax + b, cy + d(x)), where a, b, c are real numbers with a · c ≠ 0 and where d is a real polynomial.     

有关广义中心三项式系数的3个超同余式

设b,c为整数,定义广义中心三项式系数Tn(b,c)=[xn](x2+bx+c)n=「n/2」∑k=0(n2k)(2kk)bn-2kck(n∈N={0,1,…}),这里[xn]P(x)表示多项式P(x)中xn项的系数.特别地,中心Delannoy多项式Dn(x)=Tn(2x+1,x2+x)(n ∈ N),中心三项式系数...     

Dynamics of Some Three-Dimensional Lotka–Volterra Systems

We characterize the dynamics of the following two Lotka–Volterra differential systems:

$$\begin{aligned} \begin{array}{lll} \dot{x}=x(r+a y+b z), &{} &{} \dot{x}=x(r+ax+b y+c z),\\ \dot{y}=y(r-a x+c z), &{} \quad \text{ and }\quad \quad &{} \dot{y}=y(r+a x+dy+e z),\\ \dot{z}=z(r-b x-c y), &{} &{} \dot{z}=z(r+a x+d y+fz). \end{array} \end{aligned}$$

We analyze the biological meaning of the dynamics of these Lotka–Volterra systems

     

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...     

关于Thue方程的解数

设ｍ是正整数，ｆ（Ｘ，Ｙ）＝ａ０Ｘｎ＋ａ１Ｘ（ｎ－１）Ｙ＋．．．＋ａｎＹｎ∈Ｚ［Ｘ，Ｙ］是Ｑ上不可约化的叫ｎ（ｎ≥３）次齐次多项式。本文证明了：当ｇｃｄ（ｍ，ａ０）＝１，ｎ≥４００且ｍ≥１０（３５）时，方程｜ｆ（ｘ，ｙ）｜＝ｍ，ｘ，ｙ∈ｚ，ｇｃｄ（ｘ，ｙ）＝１，至多有６ｎｖ（ｍ）组解（ｘ，ｙ），其中ｖ（ｍ）是同余式Ｆ（ｚ）＝ｆ（ｚ，１）≡０（ｍｏｄｍ）的解数。特别是当ｇｃｄ（ｍ，ＤＦ）＝１时，该方程至多有６ｎ（ω（ｍ）＋１）组解（ｘ，ｙ），其中ＤＦ是多项式Ｆ的判别式，ω（ｍ）是ｍ的不同素因数的个数．     

Diophantine方程组a~2+b~2=c~r和x~2+b~y=c~z的一点注记

设r是大于1的正奇数,a,b,c是满足a~2+b~2=c~r的互素正整数.证明了:当r(?)5(mod8),c>10~(12)r~4且b是奇素数的方幂时,方程x~2+b~y=c~z仅有正整数解(x,y,z)=(a,2,r).     

Die Endlichen Polardreiseitgeometrien

LetG be a finite group which is generated by a subsetS of involutions satisfying the theorem of the three reflections: Ifa,b,x,y,z ∈ S, ab ≠ 1 and ifabx,aby,abz are involutions, thenxyz ∈ S. Assume thatS contains three elements which generate a four-group. IfS contains four elements of which no three have a product of order two, then one of the following occurs.

1. G?PGL(2,n), n≡1 (mod 2).
2. G?PSL(2,n), n≡1 (mod 2) and n≥5.
3. G?PSU(3,16).
4. G/Z(G)?PSL(2,9) with ¦Z(G)¦=3.

     

On functional which are orthogonally additive modulo Z

Let E be a real inner product space with dimension at least 2, D ? E, f: E → R with f(x+y)?f(x)?f(y) ∈ Z for all orthogonal x,y ∈ E, and f(D) ? (?γ,γ)+Z witn some real γ > 0. We prove that, under some additional assumptions, there are a unique linear functional A: E → R and a unique constant d ∈ R with f(x)?d∥x∥²?A(x) ∈ Z for x ∈ E. We also show some applications of this result to the determination of solutions F: E → C of the conditional equation: F(x+y) = F(x)F(y) for all orthogonal x,y ∈ E.     

分数阶Schrodinger—Kirchhoff方程无穷多高能量解的存在性

本文研究如下带有变号势函数的分数阶Schrodinger Kirchhoff方程(a+b∫∫R^N|u(x)-u(y)|^p/|x-y|^N+p^sdxdy)^p-1(-△)p^su+λV(x)|u|^p-2u=f(x,u)-μg(x)|u|^q-2u,x∈R^N.其中s∈(0,1),p∈[2,∞),q∈(l,p),a,b>0,λ,μ>0均为正常数,在V,f,g等函数合适的条件下,运用喷泉定理获得该系统无穷多高能量解的存在性.     

Diophantine方程组a~2+b~2=c~r和a~x+b~y=c~z的一点注记

设r是大于1的正奇数,m是正偶数,V(r)+U(r)(-1)~(1/2)=(m+(-1)~(1/2))~r.本文证明了:当a=|V(r)|,b=|U(r)|,c=m~2+1时,如果r≡5(mod8),m>r~2且r<11500或者m>2r/π且r>11500,则方程a~x+b~y=c~z仅有正整数解(x,y,z)=(2,2,r).     

The spectrum of self-converse DTS

A directed triple system, DTS(v) = (X,??), is called self-converse if it and its converse (X,??^?1) are isomorphic, where ?? = {(z,y,x);(x,y,z) ∈ ??}. In this article, the existence spectrum of self-converse DTS(v) is given, which is v ≡ 0 or 1 (mod 3) and v ≠ 6. © 1994 John Wiley & Sons, Inc.     

Left conjugacy closed loops of nilpotency class two

Every LCC loop Q with Inn Q abelian is nilpotent class two. A loop Q of nilpotency class two is LCC ? L(x, y) = L(y, x) for all x, y ∈ Q ? ?/Z(Mlt Q) is abelian ? [x, y, z] = [x,z,y] for all x, y, z ∈ Q ? [x, y, z] = [xy, z][x, z]^?1 for all x, y, z ∈ Q. All nilpotent LCC loops of order p² are described, and some of their multiplication groups are computed.     

不可由ax＋by＋cz表出的最大正整数

本文给出了在及ｃ的条件下不可由ａｘ＋ｂｙ＋ｃｚ表出的最大正整数：ｂ（ａ，ｃ）十ｃ（ａ，ｂ）－ａ－ｂ－ｃ．     

Liouvillian and analytic integrability of the quadratic vector fields having an invariant ellipse

We characterize the Liouvillian and analytic integrability of the quadratic polynomial vector fields in R2 having an invariant ellipse.More precisely,a quadratic system having an invariant ellipse can be written into the form x=x2＋y2-1＋y（ax＋by＋c）,y=x（ax＋by＋c）,and the ellipse becomes x2＋y2=1.We prove that（i） this quadratic system is analytic integrable if and only if a=0;（ii） if x2＋y2=1 is a periodic orbit,then this quadratic system is Liouvillian integrable if and only if x2＋y2=1 is not a limit cycle;and（iii） if x2＋y2=1 is not a periodic orbit,then this quadratic system is Liouvilian integrable if and only if a=0.     

关于一个素数和一个素数的k次方和问题

设k≥2,且Hk表示一个正整数n的集合,使得该集合中的元素满足a+bk≡n(modq)对任意的q,在模q的既约剩余系中有解,令Dk(N)表示所有的n≤N,且n∈Hk且不能表成p1+p2k=n形式的整数.那么在GRH下, Dk(N)相似文献   

某类均差分的值分布

研究了某类均差分的值分布问题.令n,m∈N,n>m,c∈C\{0},f(z)是超越亚纯函数,P(z)为非零多项式.一系列关于均差分F(z)=(Δ_c~nf(z))/(Δ_c~mf(z))和F~*(z)=(Δ_c~nf(z))/(Δ_c~mf(z))-P(z)的零点存在性的结果被证明.     

GENERALIZED HILBERT OPERATOR AND FEJR-RIESZ TYPE INEQUALITIES ON THE POLYDISC

Let f be a holomorphic function on the unit polydisc Dn,with Taylor expansion f(z) = ∞ |k|=0 akzk ≡∞ (k1+···+kn=0) (ak1,···,kn zk1 1znkn)where k = (k1, , kn) ∈ Z+n. The authors define generalized Hilbert operator on Dn by Hγ,n(f)(z) = ∞ |k|=0 i1,···,in≥0 ai1,···,in n j=1 Γ(γj + kj + 1)Γ(kj + ij + 1) Γ(kj + 1)Γ(kj + ij + γj + 2) zk,where γ∈ Cn, such that R γj > -1, j = 1, 2, , n. An upper bound for the norm of the operator on Hardy spaces Hp(Dn) is found. The authors also present a Fejér-Riesz type inequalit...     

关于指数丢番图方程a~x+b~y=c~z的Terai猜想

本文证明了:当a=|m(m4-10m2+)|,b=5m4-10m2+1,c=m2+1,其 中m是偶数时,如果m≥542,则方程ax+by=cz仅有正整数解(x,y,z)=(2,2,5).