广义Morrey 空间上带变量核的Littlewood-Paley 算子

该文给出了一类带变量核的抛物型Littlewood-Paley 算子g_Φ 在 广义 Morrey 空间L^p,ω(Rⁿ)上的有界性. 作为上述结果的应用, 得到了g_Φ 与 BMO 函数 b(x)生成的交换子[b, g_Φ]在L^p,ω( Rⁿ)上的有界性.     

可变核Marcinkiewicz积分交换子在Herz型Hardy空间上的有界性

该文研究由可变核Marcinkiewicz 积分和Lip_β (Rⁿ)(0 <β≤ 1)函数生成的交换子μ_{Ω, b}. 证明了当可变核Ω∈L^∞(Rⁿ)×L^r(S^n-1)(r≥1)$时, 交换子μ_{Ω, b}从Herz型Hardy空间到Herz空间的有界性. 同时建立了参数型Marcinkiewicz 积分的交换子μ^ρ_{Ω, b}在Herz型Hardy空间上的有界性.     

共形映像的Hausdorff 测度及其算法

对于Rⁿ 中满足0 < H^s(K) < ∞ 的任意紧致集K, 我们考虑其在共形映射f 作用下的像集的Hausdorff 测度H^s(f(K)). 本文给出了下面结果:
H^s(f(K)) = H^s(K) · ∫_K |D_xf|^sdμ(x),
其中概率测度μ = (H^s|K/H^s(K)) . 给定满足开集条件的自相似集K, 测度μ 恰好是自相似测度, 因此可以应用上述公式计算f(K) 的Hausdorff 测度, 例如, K 是λ-Sierpinski 地毯, f(z) = z+εz², 其中0 < λ ≤1/4,复数ε 满足|ε| ≤ 0.1. 而此刻f(K) 恰好是自共形集, 因此我们的算法能计算一类特殊的具有非线性结构的自共形集的Hausdorff 测度.     

齐次乘子算子的交换子

记H^l={w∈C^∞(R^k\{0}):w是l次齐次函数),R^_(-a)(m)是Taylor级数余项算子的n重叠合:m=(m₁,…,m_n)∈Zⁿ,Z记非负整数的集,α∈(R^k)ⁿ,定义 其中a=(a₁,…,a_n),a_i,f∈(R^k), 主要结果如下: 1.证明了几个介于算子T_^R(-a)^{(m)_w(ξ)),(a,f})的类与多线性奇异积分算子的类之间的对等定理; 2.作为应用,算子及 的某些有界性结果被给出,其中Ω∈H⁰,|β|≤|m|,且,m_i≥1。     

分数次积分算子交换子在Morrey 空间上的有界性特征

本文证明了: 如果分数次积分算子交换子[b, T_Ω,α] 从Morrey 空间L^p, ^λ(Rⁿ) 到L^q,^λ(Rⁿ) (1 n). 这个结果改进并推广了前人的结果.     

非参数回归函数最近邻估计的强相合性

设(X,Y),(X₁,Y₁),…,(X_n,Y_n)为取值R^d×R的独立同分布随机向量,E|Y|<∞。设m_n(x)为m(x)=E(Y|X=x)的最近邻估计。本文在E|Y|^r<∞(对某个r>1)或E{exp(t|Y|^λ)}<∞(对某个λ>0及t>0)的条件下,建立了m_n(x)的强相合性。其它附加条件均与(X,Y)的分布无关。     

NN-模式识别中条件误差概率收敛性的充要条件

Let (θ₁,X₁),…, (θ_n,X_n), (θ, X) be iid random vectors ,where θ∈{0,1},X∈R^d Denote by θ′_n the nearest neighbour discriminator of θ based on the training samples (θ₁,X₁),…, (θ_n,X_n) and the observed X; put(?). This paper gives a sufficient and necessary condition for (?) as n→∞, namely (P(θ=0, X=x)-P(θ=1, X=x))²·P(θ=0, X=x)·P(θ=1, X=x)=0 for every x∈R^d.This generalizes a previous result of the authors [5] and improves a result of Wagner, T.J. [2].     

关于多元函数最佳逼近精确阶的Timan问题

关于找一个充分必要条件使Ω^k(f,1/σ)L_p(Rⁿ)=O(A_σ(f)L_p(Rⁿ)),σ→∞,成立的Timan问题被解决.这个条件是Q^k(f,δ)L_p(Rⁿ)=O(Ω^k+1(f,δ)L_p(Rⁿ)),δ→0.     

关于g-函数的一些性质

本文得到的主要结果是:当f(x)∈BMO(Rⁿ)时,f的g-函数或者几乎处处发散,或者几乎处处取有限值;如属后者,则g(f)∈BMO(Rⁿ),且||g(f)||_*c||f||_*,而c只与空间维数有关。     

线性模型中误差方差的二次型估计的可容许性问题

设有线性模型Y=(y₁…y_n)’=Xβ+ε=X(β₁…β_p)’+(ε₁…ε_n)’,这里n≥p,X已知,ε₁,…,ε_n相互独立,E(ε_i)=0,E(ε_i²)=σ²,E(ε_i³)=0,E(ε_i⁴)=3σ⁴,i=1,…,n,β∈R^p,0<σ~2<∞。令?={Y’AY:A≥0}。当损失函数为σ^-4(d-σ²)²且X=I_n或者X=1_n时,给出了 Y’AY(A≥0)在?中是σ₂的可容许估计的充分必要条件。又当ε～N(0,σ²I_n)时,给出了Y’AY(A≥0)在σ²的一切估计类中是可容许的充分条件。     

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.     

Estimates of stability of characterization of additive types of distributions

An estimate of stability of characterization of distribution types is obtained for the case of additive types. Under some conditions, the estimate has the order ε^1/3L(ε), where L(ε) is a slowly varying function. Proceedings of the Seminar on Stability Problems for Stochastic Models, Moscow, Russia, 1996, Part I.     

一类完全正则半群簇子簇格的性质

本文研究了完全正则半群簇的子簇格［Ｖ＋∩ＰＶ，Ｖ＋∩ＰＶ］的某些格运算性质，我们证明了簇Ｖ＋∩ＰＶ可分解为Ｖ与Ｖ＋∩ＰＶ的并；对任意完全正则半群簇Ｗ，有Ｗ∩（Ｖ∨Ｖ＋∩ＰＶ）＝（Ｗ∩Ｖ）∨（Ｗ∩Ｖ＋∩ＰＶ）．特别地，我们得到了等式Ｖ＋∩ＰＶ＝Ｖ成立的若干条件．     

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...     

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.     

Bases of the identities of products of certain varieties of groups

The following theorem is proved: The product of any variety of two-step solvable groups and a variety having a finite basis of identity relations has a finite basis of identity relations.Translated from Matematicheskie Zametki, Vol. 5, No. 1, pp. 137–144, January, 1969.     

Preservation of equivalence of derivations under reduction of depth of formulas

In this paper we consider derivations in the (&, )-fragment of the intuitionistic propositional calculus. As is known, replacement of any occurrence of a formula [F] in a sequent S by an occurrence of the formula [p], where p is a new propositional variable, with the simultaneous addition to the antecedent of the formula F p or p F depending on the sign of the occurrence of F in S, leaves the derivability unchanged. We give a proof of the fact that the natural extension of this transformation to derivations preserves the relation of equivalence of derivations, i.e., transformed derivations are equivalent if and only if the originals are equivalent. (Derivations are considered equivalent if certain of their normal forms coincide, or, what is the same, if their deductive terms coincide.) It is proved that by the iteration of this transformation, each derivation of an arbitrary sequent S can be transformed into a derivation of a sequent S, depending only on S, whose succedent is a variable, and in the antecedent there occur only formulas of the form a,a & b, a b,,(a b) c, a & b c, a (b & c), wherea, b, c are variables. Here if S is balanced, then S is also balanced. (A sequent is called balanced if each variable occurs in it no more than twice.) The familiar correspondence between certain concepts of the theory of categories and concepts of the theory of proofs allows one to assert that there has been constructed a univalent functor, mapping a free Cartesian closed category into itself.Translated from Zapiski Nauchnykh Seminarov Leningradskogo Otdeleniya Matematicheskogo Instituta im. V. A. Steklova AN SSSR, Vol. 88, pp. 197–207, 1979.