广义(PS)条件的证明

在广义Lebesgue空间Lp~(x)(Ω)和广义Sobolev空间W~(1,p(x))(Ω)的基本理论体系的基础上得到了一类p(x)-Laplace方程满足广义(PS)条件的一个充分条件.     

L~(p(x))(Ω)中关于Luxemburg范数和共轭Orlicz范数间的一个最佳不等式

令 L~(p(x))(Ω)为变指数 Lebesgue空间,其中 p：Ω→[1,∞]．‖·‖_(p(x))和‖·‖_(p(x))~o 分别表示 L~(p(x))(Ω)中的 Luxemburg 范数和共轭 Orlicz 范数．本文证明成立最佳不等式‖·‖_(p(x))≤‖·‖_(p(x))~o ≤ d_(p-,p )‖·‖_(p(x)),其中 d_(p-,p )是一个依赖于 p-=essinf_Ωp(x)和 p =esssup_Ωp(x)的常数．当1＜p-＜p ＜∞时, (?) 当 p-=1或 p =∞时,d(p-,p )是相应的极限形式．     

Sobolve空间W^k,p（x）（Ω）中的嵌入定理

本文讨论了具有指数p(x)的广义O rlicz-Sobo lev空间Wm,p(x)(Ω)的一些性质,构造了sobo lev空间Wm,p(x)(Ω)中的嵌入定理,并给出了在区域为Ωk时的定理的证明与推论。     

类p(x)-Laplace方程解的存在性

应用变分法且以临界点理论为工具,利用山路引理,借助广义Lebesgue空间和广义Sobolev空间的基本理论,尤其是嵌入定理,H■lder不等式及Egorov定理获得了当非线性项满足超线性增长条件时,类p(x)-Laplace方程解的存在性.     

一类有界区域上p(X)-Laplace方程解的存在性

在变指数Lebesgue空间Lp(x)(Ω)、变指数Sobolev空间W~1,p(x)(Ω)、加权变指数Lebesgue空间Lp(x)(Ω;|x~(α(x)))和加权变指数Sobolev空间W~1,p(x)(Ω;|x|~(a(x)))的基本理论体系的基础上利用山路引理得到一类p(x)-Laplace方程非平凡解的存在性.     

偶阶非线性中立型时滞微分方程的振动性

本文研究一类新的偶阶非线性中立型时滞微分方程(r(t)|z~((n-1))(t)|~(a-1)z~((n-1))(t))'+F(t,x(g(t)))=0,t≥t_0(其中z(t)=x(t)+p(t)x(T(t)),α 0为常数,n为偶数)的振动性.利用广义Riccati不等式和积分平均技巧得到方程一切解均为振动的若干新的振动准则,推广和改进了一些文献中的结果.     

拟线性次椭圆方程组在Morrey空间上的部分正则性

证明了拟线性次椭圆方程组-X_α~*(a_(ij)~(αβ)(x,u)X_βu~j)=-X_α~*f_i~α+g_i,i=1,2,…,N,x∈Ω的弱解广义梯度Xu在Morrey空间L_x~(p,λ)(Ω,R~(mN))(p2)上的部分正则性,其中光滑实向量场族X=(X_1,X_2,…,X_m)满足H(o|¨)rmander有限秩条件,X_α~*是X_α的共轭;而且主项系数a_(ij)~(αβ)(x,u)关于x一致VMO(Vanishing Mean Oscillation的缩写,消失平均震荡)间断,且关于u为一致连续.     

一类N维非线性波动方程的Cauchy问题

证明下列非线性波动方程的Cauchy问题v_(tt)-α△v_(tt)-Δv=g(v)-αΔg(v),x∈R~N,t>0,(1)v(x,0)=v_0(x),v_t(x,0)=v_1(x),x∈R~N(2)在空间C~2([0,∞);H~s(R~N))(s>N/2)中存在唯一整体广义解v和在空间C~2([0,∞);H~s(R~N))(s>2+N/2N)中存在唯一整体古典解v,即u∈C~2([0,∞);C_B~2(R~N)).还证明Cauchy问题(1),(2)在C~3([0,∞);W~(m,p)(R~N)∩L~∞(R~N))(m≥0,1≤p≤∞)中有唯一整体广义解v和在C~3([0,∞);W~(m,p)(R~N)∩L~∞(R~N))(m>2+N/P)中有唯一整体古典解v,即v∈C~3([0,∞);C~2(R~N)∩L~∞(R~N)).     

在空间W_0~(1，x)L~(P(x))(Q)及其共轭空间中的若干收敛性定理

本文证明了在空间W_0~(1,x)L~(p(x))(Q)及其共轭空间中三个收敛性定理.在附加较弱条件的情况下,给出了几乎处处收敛蕴含弱收敛,弱收敛蕴含强收敛.     

含p(x)-Laplacian算子的Neumann问题解的存在性

利用极大单调算子理论,给出了一类含p(x)-Laplacian算子的Neumann边值问题解的存在的充分条件.讨论用到了Lp(x)(Ω)和W01,p(x)(Ω)空间的理论.     

Characterization of types of asymptotic discernibility of families of hypotheses

We give a characterization of the types of asymptotic discernibility of families of hypotheses in the case of hypothetical measures that are not, in general, mutually absolutely continuous. The case when the logarithm of the likelihood ratio admits an asymptotic expansion of the type of an expansion with local asymptotic normality is examined in detail. Examples are studied.Translated fromTeoriya Sluchainykh Protsessov, Vol. 15, pp. 64–71, 1987.     

Study of the blow-up of solutions of systems of equations of hydrodynamic type

Mathematical Notes - We study the initial boundary-value problem for three-dimensional systems of equations of pseudoparabolic type. The system is similar to the Oskolkov system, but differs from...     

Singularities of Solutions of One Class of Equations of Continuum Mechanics

We analyze one class of families of integral equations and describe the dependence of the singularities of solutions of integral equations on the dimensions of the families of kernels of equations. On the basis of these results, we propose procedures for the construction of approximate solutions for a small parameter.     

Determination of asymptotic solutions of problems of nonlinear theories of thermoviscoelasticity

It is shown that the asymptotic solution of a problem of the nonlinear theory of thermoviscoelasticity, if it exists, can be found directly from the solution of the asymptotic boundary-value problem without completely solving the starting problem.M. V. Lomonosov Moscow State University. Translated from Mekhanika Polimerov, No. 3, pp. 395–400, May–June, 1976.     

Emptiness of set of points of lower semicontinuity of Lyapunov exponents

We consider parametric families of differential systems with coefficients that are bounded and continuous on the half-line and uniformly in time continuously depend on a real parameter. For each Lyapunov exponent, we construct a family such that the Lyapunov exponent of its systems treated as a function of the parameter is not a lower semicontinuous function for any value of the parameter.     

图表示范畴的两个子范畴

引进图表示范畴的两个子范畴,研究它们的同调性质。     

Distribution of types of symmetry of tensors of high degree

The asymptotic distribution of tensors of degree N in symmetry types is studied in this paper.Translated from Zapiski Nauchnykh Seminarov Leningradskogo Otdeleniya Matematicheskogo Instituta im. V. A. Steklova AN SSSR, Vol. 155, pp. 181–186, 1986.     

Properties of operators of extension and contraction of ideals of algebras of invariants of reductive groups in positive characteristic

V. I. Lenin Tashkent State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 25, No. 4, pp. 53–61, October–December, 1991.