齐型空间中分数次积分交换子的加权端点估计

该文得到齐型空间中分数次积分交换子[b,I_α]的加权端点估计ω({x∈X:|[b,I_α]f(x)|t})≤Cψ(∫_xA(||b||_*(|f(x)|/t)■(ω(x))dμ(x))其中b∈BMO(X,d,μ),A(t)=tlog(e+t),ψ(t)=[tlog(e+t~α)]~(1/(1-α)),■(t)=t~(1-α)log(e+t~(-α)).     

一维空间中临界离散加权型Hardy-Littlewood-Sobolev不等式

本文建立了R1中临界版的离散加权型Hardy-Littlewood-Sobolev不等式∑-N≤r,s≤N;r≠0,s≠0;r≠s(1/|r|α*arbs|s|α/|r-s|≤CαλαN‖a‖2‖b‖2),其中α≥0,a=(a-N,...,aN),b=(b-N,...,bN).当α≥1时,我们得到了最佳常数λαN为Nα-1/2,即∑-N≤r,s≤N;r≠0,s≠0;r≠s(1/|r|α*arbs|s|α/|r-s|≤CαNα-1/2‖a‖2‖b‖2).     

Liouville theorem for Choquard equation with finite Morse indices

In this article, we study the nonexistence of solution with finite Morse index for the following Choquard type equation-△u=∫RN|u(y)|p|x-y|αdy|u(x)|p-2u(x) in RN where N ≥ 3, 0 α min{4, N}. Suppose that 2 p (2 N-α)/(N-2),we will show that this problem does not possess nontrivial solution with finite Morse index. While for p=(2 N-α)/(N-2),if i(u) ∞, then we have ∫_RN∫_RN|u(x)p(u)(y)~p/|x-y|~α dxdy ∞ and ∫_RN|▽u|~2 dx=∫_RN∫_RN|u(x)p(u)(y)~p/|x-y|~αdxdy.     

有限型的首次返回例外集的测度和维数北大核心CSCD

设M=(m_(ij))是一个b×b阶矩阵且m_(ij)∈{0,1},∑_(M)是矩阵M=(m_(ij))诱导产生的有限型,σ是其上左推移算子.本文主要研究的是有限型动力系统(∑_(M),σ)上的首次返回速度问题.令τ_(k)(x)是点x∈∑_(M)首次返回到包含x的k阶柱集时间,且E_(α,β)={x∈∑_(M):lim inf_(k→∞)(logτ_(k)(x))/k=α,lim sup_(k→∞)(logτ_(k)(x))/k=β}.我们证明了:当M是不可约矩阵时,对任意0≤α≤β≤+∞,集合E_(α,β)的Markov测度要么等于0要么等于1并且具有满的Hausdorff维数.     

关于亚纯函数族■的唯一性

§1.引言设f(z)是开平面内非常数的亚纯函数,α为复数,λ为正整数,我们用E(α,f)表示f(z)-α的0点集合,用E_(?)(α,f)表示f(z)-α的重级不高于λ的0点集合,在上述集合中,每个0点仅计一次。有时我们也把E(α,f),E_(λ))(α,f)及E(b,f~~(k)),E_λ(b,f~(k))分别简记为E(α),E_(λ))(α)及E~((k))(b),E_(λ))~((k))(b),其中b为复数,k为正整数。在本文中,我们设F表示满足条件δ(0)=δ(∞)=1的开平面内非常数亚纯函数族。显然F中的函数均为超越亚纯函数(?     

WANDERING SUBSPACES OF THE HARDY-SOBOLEV SPACES OVER D~n

In this paper, we show that for log(2/3)/2log2≤β≤1/2, suppose S is an invariant subspace of the Hardy-Sobolev spaces H_β~2(D~n) for the n-tuple of multiplication operators(M_(z_1),...,M_(z_n)). If(M_(z_1)|S,..., M_(z_n)|S) is doubly commuting, then for any non-empty subset α = {α_1,..., α_k} of {1,..., n}, W_α~S is a generating wandering subspace for M_α|_S =(M_(z_(α_1))|_S,..., M_(z_(α_k))|_S), that is, [W_α~S]_(M_(α |S))= S, where W_α~S=■(S■z_(α_i)S).     

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.     

一类特殊Beatty序列中的素因子问题

研究了数论函数Ω和ω取值于一类特殊的非齐次Beatty序列[αn+β](n=1,2,…)的问题.特别地,证明了渐近公式∑ω([αn+β)=N log log N+O(N(log log N) )以及∑(一1)Ω(αn+β)=O( n/(log N 1/2)),其中α,β∈R,n∈Z+,α>0是型为1的无理数,Ω(k)和ω(k)表示整数k(≠0)的素因子个数(Ω记重数,ω不计重数).     

具有齐性核Marcinkiewicz积分交换子的Lipschitz估计

本文研究了Marcinkiewicz积分交换子μΩ,b(f)(x)=(integral from n=0 to ∞|Fb,t(f)(x)|2 dt/t3)1/2, 其中Fb,t(f)(x)=integral from n=|x-y|≤t(Ω(x-y_/|x-y|n-1)b(x)-b(y)f(y)dy及b∈Λβ,证明了算子μΩ,b是Lp(Rn) 到Fβ,∞p(Rn)上的有界算子并且也是Lp(Rn)到Lq(Rn)上的有界算子.     

The Analytic Solution of Operator Equation of the First Kind

Let W_2~1[a,b]≡W_2~1 = {u(x)| u(x) is absolute continuous real function on [α,b],and u' (x)∈L~2[α,b]}. Set inner product     

PHASE RETRIEVAL OF TIME-LIMITED SIGNALS

The problem of reconstructing a signal ψ(x) from its magnitude |ψ(x)| is of considerable interest to engineers and physicists.This article concerns the problem of determining a time-limited signal f with period 2π when |f(eix)| is known for x ∈ [-π,π].It is shown that the conditions |g(eix)| = |f(eix)| and |g(ei(x+b))-g(eix)| = |f(ei(x+b))-f(eix)|,b = 2π,together imply that either g = wf or g = vf,where both w and v have period b.Furthermore,if 2bπ is irrational then the functions w and v reduce to some constants c1 and c2,respectively;if 2bπ is rational then w takes the form w=eiαB1(eix)B2(eix) and v takes the form ei(x2πN/b+α)B1(eix)B2(eix),where B1 and B2 are Blaschke products.     

模糊图的(α,β)-截图

本文将模糊图的α-截图概念进行推广,引入了模糊图的(α,β)-截图的概念。首先,我们定义一个模糊图ξ=(V,σ,μ)的(α,β)-截图为一个刚性图ξα,β=(V_α,E_β),满足V_α={u∈V|σ(u)≥α},E_β={(u,v)|μ(u,v)≥β},其中0≤α,β≤1。然后,我们得到(α,β)-截图的一系列性质,从而可以借助(α,β)-截图研究模糊图。     

模糊图的(α,β)-截图北大核心

本文将模糊图的α-截图概念进行推广,引入了模糊图的(α,β)-截图的概念。首先,我们定义一个模糊图ξ=(V,σ,μ)的(α,β)-截图为一个刚性图ξα,β=(V_α,E_β),满足V_α={u∈V|σ(u)≥α},E_β={(u,v)|μ(u,v)≥β},其中0≤α,β≤1。然后,我们得到(α,β)-截图的一系列性质,从而可以借助(α,β)-截图研究模糊图。     

加权全能量最小的圆环形变北大核心CSCD

主要考虑如下加权全能量极值问题:h∈■^(inf)(A_(1),A_(2))α∫∫A_(1)(|h_(N)|^(2)+|h_(T)|^(2))1/(|h_(z)|^(2))dz+β∫∫A_(1)|h_(N)|^(2)+|h_(T)|^(2)/J(z,h)1/|z|^(2)dz,其中■(A_(1),A_(2))代表从圆环A_(1)到圆环A_(2)的所有保向同胚映射的集合.研究得到唯一的极值映射为径向拉伸映射.这将[Iwaniec T,Onninen J.Hyperelastic deformations of smallest total energy[J].Arch Rational Mech Anal,2009,194:927-986.]的结果推广至非欧情形.同时,也分别研究了圆环上的加权调和能量的极值问题与加权偏差的极值问题.     

Precise asymptotics in self-normalized sums of iterated logarithm for multidimensionally indexed random variables

In the case of Zd (d ≥ 2)-the positive d-dimensional lattice points with partial ordering ≤, {Xk,k ∈ Zd } i.i.d. random variables with mean 0, Sn = ∑k≤nXk and Vn2 = ∑j≤nX2j, the precise asymptotics for ∑n1/|n|(log|n|)dP(|Sn/vn|≥ ε√loglog|n|) and ∑n(logn|)δ/|n|(log|n|)d-1 P(|Sn/Vn| ≥ ε√log n), as ε ↘ 0, is established.     

三维除数问题误差项估计的改进

<正> 用d_3(n)记将n表成三个因子乘积的表法个数,则有渐近公式此处P_3(log x)为log x的一个二次多项式.又用α_3表使     

分数次积分算子的双权弱型赋范不等式

证明了若权函数(u,v)满足下列A_p型条件:对δ＞0及任意的方体Q, |Q|~(pα/n)‖u‖L(log L)~(2p-1+δ),Q(1/|Q|∫_Qv(x))-(p′/pdx)~(p/p′)≤K＜∞,则分数次积分算子I_α,0＜α＜n,是从L~p(v)到L~(p,∞)(u)的有界算子,1＜p＜∞．     

凹角域上Green函数有限元逼近的逐点估计及有限元外推

本文运用权范数方法证明了多角形区域上Green函数有限元逼近的逐点估计 |G_z(x)-G_z~h(x)|≤C(h~|lnh|~3/|x-z|~α),?x,z∈Ω,其中C为与x,z,h无关的常数θ<α<β_M,β_M=π/α_M,α_M为Ω的最大内角.由此可导出凹角域上有限元逼近的渐近展开. 考虑模型问题     

具有弱衰减初值的不同速度的半线性Klein-Gordon方程组解的生命区间估计

本文讨论了具弱衰减Cauchy初值的不同速度半线性Klein-Gordon方程组解的生命区间估计问题.当初值具有尺度∈时,得到生命区间的下界估计∈-2|log ∈|-α(当空间维数d≥3时α=2,当d=2时α=3).     

Multiple solutions for weighted nonlinear elliptic system involving critical exponents

In this paper,by using the idea of category,we investigate how the shape of the graph of h(x)affects the number of positive solutions to the following weighted nonlinear elliptic system:-div(|x|-2au)-μu|x|2(a+1)=αα+βh(x)|u|α-2|v|βu|x|b2*(a,b)+λK1(x)|u|q-2u,in,-div(|x|-2av)-μv|x|2(a+1)=βα+βh(x)|u|α|v|β-2v|x|b2*(a,b)+σK2(x)|v|q-2v,in,u=v=0,on,where 0∈is a smooth bounded domain in RN(N 3),λ,σ0 are parameters,0μμa(N-2-2a2)2;h(x),K1(x)and K2(x)are positive continuous functions in,1 q2,α,β1 andα+β=2*(a,b)(2*(a,b)2N N-2(1+a-b),is critical Sobolev-Hardy exponent).We prove that the system has at least k nontrivial nonnegative solutions when the pair of the parameters(λ,σ)belongs to a certain subset of R2.