一个强(d,e;u)-析取矩阵的构作和性质

定义了一个从"k-子集"对到一个二元数集{0,1}上的函数,根据这个函数构作了一个强(d,e;u)-析取矩阵M,计算了它的参数和汉明距离.     

一个Inhibitor模型的构作及其应用

Inhibitor模型是群测理论的一个特殊的数学模型,(d+(m out of r))-析取矩阵是Inhibitor模型.利用有限n阶仿射平面的性质构作了(d+(m out of r))-析取矩阵并计算了它的参数,论述了它的应用.     

具有常数行重的一类d-析取矩阵的界

首先介绍了辛空间上子空间的一些包含性质,利用这些性质构作了一类具有常数行重的dλ-析取矩阵,然后给出了这类矩阵相关参数的界.     

基于轨道上的(d,r,z]-析取矩阵

利用循环群Z_v上的连续区组轨道构作了(d,r,z]-析取矩阵并在此基础上通过添加列分析了它们的性质.     

基于二元叠加码M_q(n,k,d)的随机Pooling设计

以2002年Ngo Hung Q.和DU Ding-Zhu构作的二元叠加码M_q(n,k,d)为基础生成一个随机Pooling设计,研究了这个随机Pooling设计的参数和性质.     

二元(p,r,d)-码的构作及其应用

令n是一个正整数,[n]={1,2,…,n}.利用集合[叫上的s-子集族((ns))构作了二元(p,r,d)-叠加码,研究了它的容错和析取性质并介绍了它在非适应性群测(Nonadaptive Group Testing)方面的应用.     

n维有限射影空间上d~e——析取矩阵的新构作

利用n维有限射影空间上的一些性质,构作了组合群验的数学模型de-析取矩阵,并研究了它的参数和Hamming距离.     

基于两个常重码的(t,∈)-析取矩阵

(t,∈)-析取矩阵是组合群测理论中一个新型的随机数学模型,以两个二元常重叠加码为基础,根据它的性质和参数构作了一个(t,∈)-析取矩阵并给出了(t,∈)-析取矩阵的平均汉明距离.     

利用伪辛空间上一类子空间构作d~e析取矩阵

利用伪辛空间上一类子空间m维(m,0,0,0)型子空间的性质构作了d~e析取矩阵M_q(2v+1,m,d),并利用子空间的计数定理计算了它的参数.通过研究N(m,0,0,0;2v+1)的单调性,得到了矩阵M_q(2v+1,m,d)的最优值.     

n阶射影平面上可容错的(d,r;z]-disjunct矩阵

一个(d,r;z]-disjunct矩阵在许多领域有着极为广泛的应用.利用n阶射影平面的性质构作了(d,r;z]-disjunct矩阵,并研究了它的检错性和纠错性.     

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...     

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.     

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.     

Axiomatizability of reducts of algebras of relations

In this paper, we prove that any subreduct of the class of representable relation algebras whose similarity type includes intersection, relation composition and converse is a non-finitely axiomatizable quasivariety and that its equational theory is not finitely based. We show the same result for subreducts of the class of representable cylindric algebras of dimension at least three whose similarity types include intersection and cylindrifications. A similar result is proved for subreducts of the class of representable sequential algebras. Received October 7, 1998; accepted in final form September 10, 1999.     

Lengths of periods of continued fractions of square roots of integers

Empirical study of the period’s length T of the continued fractions of $\sqrt{Q}$ (for growing integers Q) shows several strange asymptotical results, for instance, $T\leq C\sqrt{Q}\ln{Q}$ . These results show important differences between the statistics of the elements of the continued fractions of random real numbers and of square roots of random integers.