Some Endpoint Estimates for the Multiplier Operator

In this paper,the author proves that Multiplier operator is bounded on BMO（Rⁿ）,LMO（Rⁿ） and CBMO^ρ,λ（Rⁿ）respectively if some concellation conditions are satisfied.     

Special John-Nirenberg-Campanato spaces via congruent cubes

Let p ∈ [1, ∞), q ∈ [1, ∞), α∈ R, and s be a non-negative integer. Inspired by the space JNp introduced by John and Nirenberg(1961) and the space B introduced by Bourgain et al.(2015), we introduce a special John-Nirenberg-Campanato space JN^con_(p,q,s) over Rⁿ or a given cube of R;with finite side length via congruent subcubes, which are of some amalgam features. The limit space of such spaces as p →∞ is just the Campanato space which coincides with the space BMO(the space of functions with bounded mean oscillations)when α = 0. Moreover, a vanishing subspace of this new space is introduced, and its equivalent characterization is established as well, which is a counterpart of the known characterization for the classical space VMO(the space of functions with vanishing mean oscillations) over Rⁿ or a given cube of Rⁿ with finite side length.Furthermore, some VMO-H¹-BMO-type results for this new space are also obtained, which are based on the aforementioned vanishing subspaces and the Hardy-type space defined via congruent cubes in this article. The geometrical properties of both the Euclidean space via its dyadic system and congruent cubes play a key role in the proofs of all these results.     

ISOMORPHISMS OF VARIABLE HARDY SPACES ASSOCIATED WITH SCHRÖDINGER OPERATORS

Let L:=-△+V be the Schrodinger operator on Rⁿwith n≥3,where V is a non-negative potential satisfying△^-1(V)∈L^∞(Rⁿ).Let w be an L-harmonic function,determined by V,satisfying that there exists a positive constantδsuch that,for any x∈Rn,0<δ≤w(x)≤1.Assume that p(·):Rⁿ→(0,1]is a variable exponent satisfying the globally log-H?lder continuous condition.In this article,the authors show that the mappings HL^p(·))(Rⁿ)■f■wf∈H^p(·)(Rⁿ)and HL^p(·)(Rⁿ)■f■(-△)^1/2L^-1/2(f)∈H^p(·)(Rⁿ)are isomorphisms between the variable Hardy spaces HL^p(·)(Rⁿ),associated with L,and the variable Hardy spaces H^p(·)(Rⁿ).     

Fourier transform of anisotropic mixed-norm Hardy spaces

Let a:=(a1,…,an)∈[1,∞)n,p:=(p1,…,pn)∈(0,1]n,Hpa(Rⁿ)be the anisotropic mixed-norm Hardy space associated with adefined via the radial maximal function,and let f belong to the Hardy space Hpa(Rⁿ).In this article,we show that the Fourier transform fcoincides with a continuous function g on?n in the sense of tempered distributions and,moreover,this continuous function g,multiplied by a step function associated with a,can be pointwisely controlled by a constant multiple of the Hardy space norm of f.These proofs are achieved via the known atomic characterization of Hpa(Rⁿ)and the establishment of two uniform estimates on anisotropic mixed-norm atoms.As applications,we also conclude a higher order convergence of the continuous function gat the origin.Finally,a variant of the Hardy-Littlewood inequality in the anisotropic mixed-norm Hardy space setting is also obtained.All these results are a natural generalization of the well-known corresponding conclusions of the classical Hardy spaces Hp(Rⁿ)with p∈0,1],and are even new for isotropic mixed-norm Hardy spaces on∈n.     

Dynamical behaviors of non-autonomous fractional FitzHugh-Nagumo system driven by additive noise in unbounded domains

The regularity of random attractors is considered for the non-autonomous fractional stochastic FitzHugh-Nagumo system.We prove that the system has a pullback random attractor that is compact in Hs(Rⁿ)×L²(Rⁿ)and attracts all tempered random sets of L²(Rⁿ)×L²(Rⁿ)in the topology of Hs(Rⁿ)×L²(Rⁿ)with s∈(0,1).By the idea of positive and negative truncations,spectral decomposition in bounded domains,and tail estimates,we achieved the desired results.     

一类关于波方程的振荡乘子在 Triebel-Lizorkin空间中的有界性

研究了与波方程的Cauchy问题相关的振荡乘子在Triebel-Lizorkin空间审F_p^γ,q（Rⁿ）中的有界性.     

带有分布导数的反应扩散方程在Rn中全局吸引子的存在性

该文考虑Rⁿ中一类带有加权项V(x)和分布导数的反应扩散方程解的长时间行为,证明了(L²(Rⁿ),L²(Rⁿ)∩L^p(Rⁿ))-全局吸引子的存在性;而且对任意的δ₁∈[0,+∞),该吸引子能够在L²∩L^p+δ₁-拓扑下吸引L²(Rⁿ)中的有界集.     

分数阶拉普拉斯算子指数非线性热方程的局部适定性解

本文研究了分数阶拉普拉斯算子指数非线性热方程的柯西问题.将expL₀^p_o(Rⁿ)中的初始条件分解成光滑部分和exp L^p(Rⁿ)中的很小部分,得到了Orlicz空间exp L^p(Rⁿ)中的局部适定性解.     

欧氏空间中升序变换半群的格林关系和正则元

设L(Rⁿ)表示n维欧氏空间Rn)表示n维欧氏空间Rⁿ的所有线性变换构成的集合,||α||表示向量α的欧氏长度,由欧氏长度建立起向量间的序关系.令:O+(Rn的所有线性变换构成的集合,||α||表示向量α的欧氏长度,由欧氏长度建立起向量间的序关系.令:O+(Rⁿ)={f∈L(Rn)={f∈L(Rⁿ)|(?)α∈Rn)|(?)α∈Rⁿ,||f(α)||≥||α||},则O+(Rn,||f(α)||≥||α||},则O+(Rⁿ)是欧氏空间Rn)是欧氏空间Rⁿ的所有升序变换构成的集合,其在交换的合成运算下构成一个半群,讨论了O+(Rn的所有升序变换构成的集合,其在交换的合成运算下构成一个半群,讨论了O+(Rⁿ)的格林关系和正则元.     

THE ENDPOINT ESTIMATE FOR FOURIER INTEGRAL OPERATORS

Let T_a,φbe a Fourier integral operator defined by the oscillatory integral T_a,φu(x)=1/(2π)ⁿ∫_Rⁿ^e^iφ(x,ξ)a(x,ξ)(u)(ξ)dξ,where a∈S_e,δ^mandφ∈Φ²,satisfying the strong non-degenerate condition.It is shown that if0<(e)≤1,0≤δ<1 and m≤e²-n/2,thenT_α,φis a bounded operator from L^∞(Rⁿ)to BMO(Rⁿ).     

具有BMO系数的拟线性椭圆方程解的BMO估计

We establish a global limiting case of nonlinear Calderon-Zygmund theory to quasilinear elliptic equations div A(x,Du) = div(|F|~(p-2)F) under the BMO smallness of the nonlinearity,that is |F|~(p-2)F∈BMO implies that Du ∈BMO.     

新的齐型BMO, Lipschitz空间上的奇异积分算子

Let(X, d, μ) be a space of homogeneous type, BMO_A(X) and Lip_A(β,X) be the space of BMO type,lipschitz type associated with an approximation to the identity {A_t}_t0 and introduced by Duong,Yan and Tang, respectively. Assuming that T is a bounded linear operator on L~2(X), we find the sufficient condition on the kernel of T so that T is bounded from BMO(X) to BMO_A(X) and from Lip(β, X) to Lip_A(β, X). As an application, the boundedness of Calderón-Zygmund operators with nonsmooth kernels on BMO(R~n) and Lip(β, R~n) are also obtained.     

有限域上幂剩余正规元的存在性

GF(q)是q个元的有限域,q是素数的方幂,n是正整数,GF(q~n)为GF(q)的n次扩张.用指数和估计的方法给出了3种情形下幂剩余正规元存在的充分条件,即(1)GF(q~n)中存在元ξ为GF(q)上的幂剩余正规元;(2)GF(q~n)中存在元ξ与ξ~(-1)同时为GF(q)上幂剩余正规元;(3)对GF(q~n)~*中任意给定的非零元a和b,GF(q~n)中存在元ξ与ξ~(-1)同时为GF(q)上d次幂剩余正规元,且满足Tr(ξ)=a,Tr(ξ~(-1))=b.     

一类多线性奇异积分算子的加权估计

In this paper, weighted estimates with general weights are established for the multilinear singular integral operator defined by TAf(x) = p. v.RnΩ(x- y)|x- y|n+1 A(x)- A(y)- A(y)(x- y) f(y)dy,where Ω is homogeneous of degree zero, has vanishing moment of order one, and belongs to Lipγ(Sn-1) with γ∈(0, 1], A has derivatives of order one in BMO(Rn).     

混合径角$\lambda$中心有界平均振荡空间的一个特征

在这篇文章中,我们通过Hardy算子交换子$\mathrm{H}_b$与它的对偶算子交换子$\mathrm{H}^*_b$, 其中$b\in {\mathrm{CMOL}^{p_2, \lambda}_{\rm rad}L^{p_1}_{\rm ang}(\mathbb R^n)}$,建立了混合径角$\lambda$中心有界平均振荡空间的一个特征.     

齐型空间上的Toeplitz型算子

设X是齐型空间.设T_(j,1)和T_(j,2)是具有非光滑核的奇异积分算子,或者是±II(I是恒等算子).令Toeplitz型算子T_b=■T_(j,1)M_T_(j,2),其中M_bf(x)=b(x)f(x).研究了当b∈BMO(X)时,T_b(f)在加权情况下的有界性,以及当b∈BMO(X)时,与经典Carderon-Zygmund算子相联的T_b(f)在Morrey空间上的有界性.     

齐型空间上$L^1$ 与{\rm BMO}的内插空间

本文讨论齐型空间上$L^1$ 与{\rm BMO}的内插空间, 得到下列结果:对于本文讨论齐型空间上$L^1$ 与{\rm BMO}的内插空间, 得到下列结果:对于本文讨论齐型空间上$L^1$ 与{\rm BMO}的内插空间, 得到下列结果:对于摘要：本文讨论齐型空间上L^1与BMO的内插空间，得到下列结果：对于0〈θ〈1，1≤q≤∞，有（L^1，BMO）θ，q=Lpq，其中θ=1-1/p。     

3-李代数的广义导子

给出了3-李代数的广义导子、拟导子、拟型心的定义,研究了他们之间的结构关系,并对具有极大对角环面的3-李代数的拟导子和拟型心结构进行了系统的研究.证明了(1)广义导代数GDer(A)可以分解成拟导子代数QDer(A)和拟型心QΓ(A)的直和;(2)3-李代数A的拟导子可以扩张成一个具有较大维数的3-李代数的导子;(3)拟导子代数QDer(A)包含在拟型心的正规化子中,表示为[QDer(A),QΓ(A)]?QΓ(A);(4)如果A包含极大对角环面T,那么QDer(A)和Qr(A)是T的对角模,也就是(T,T)半单地作用在QDer(A)和QΓ(A)上.     

Volume comparison in the presence of a Gromov–Hausdorff {\varepsilon} -approximation I

Let (M, g) be any compact, connected, Riemannian manifold of dimension n. We use a transport of measures and the barycentre to construct a map from (M, g) onto a flat torus ${ (\mathbb R^n/\Lambda, g_0)}$ , in such a way that its jacobian is sharply bounded from above. We make no assumptions on the topology of (M, g) and on its curvature and geometry, but we only assume the existence of a measurable Gromov–Hausdorff ${\varepsilon}$ -approximation between ${(\mathbb R^n/\Lambda,g_0)}$ and (M, g). When the Hausdorff approximation is continuous with non vanishing degree, this leads to a sharp volume comparison, $${\rm Vol}(M,g)\geq\left(1-37(n+2)^2\frac{\varepsilon} {{\rm inj}(\mathbb R^n/\Lambda,g_0)}\right)^{\frac{n}{2}}\,\vert {\rm deg}\ h \vert\ {\rm Vol}(\mathbb R^n/\Lambda,g_0)$$ where ${{\rm inj}(\mathbb R^n/\Lambda,g_0)}$ is the injectivity radius of the flat torus. Notice that the above inequality is valid for any ${\varepsilon < \frac{{\rm inj}(\mathbb R^n/\Lambda,g_0)}{37(n+2)^2}}$ .     

Bergman空间上Cowen-Douglas算子的换位

令H~∞(D)表示单位圆盘D上的有界解析函数全体构成的代数,对于■∈H~∞(D),在某种条件下,证明T=M■是一个指标为n的Cowen-Douglaus算子,并且给出了■(T)/rad■(T)可交换的一个充分条件.当n=1时,刻画了T的换位.