对合Quantale范畴的极限

构造出了对合Quantale范畴的极限结构，得到对合Quantale范畴是连通的、点化的、完备的范畴，并给出了若干特殊的极限结构。     

符号空间及逆极限空间上的正混沌

本文推广Ｌｉ－Ｙｏｒｋｅ混沌定义,给出正混沌的定义,得到一类描述正混沌的符号动力 系统．并证明紧致度量空间上的连续映射正混沌的充要条件是其逆极限空间上的移位映射是 正混沌的．     

拟仿紧性与乘积空间

本文证明了在V=L假定下,所有正规局部紧拟仿紧空间是仿紧的.并证明了正则拟仿紧性在有限对一闭映射下是逆保持的.还研究了狭义拟仿紧性的有限乘积和逆极限定理.     

拟仿紧性与乘积空间

本文证明了在V=L假定下,所有正规局部紧拟仿紧空间是仿紧的．并证明了正则拟仿紧性在有限 对一闭映射下是逆保持的．还研究了狭义拟仿紧性的有限乘积和逆极限定理．     

逆极限空间的伪轨跟踪性

证明了对于由{xi,φi,fi}∞i=l生成的逆极限系统(X∞,f∞),如果每个fi具有伪轨跟踪性,则诱导映射f∞也具有伪轨跟踪性.并构造了一个例子说明它的逆命题不成立.还证明了零维紧致度量群的自同构拓扑共轭于一族有限型子转移生成的逆极限系统.     

逆极限空间的伪轨跟踪性

证明了对于由｛Ｘｉ,ｉ,ｆｉ｝ｉ＝１生成的逆极限系统（Ｘ∞,ｆ∞）,如果每个ｆｉ具有伪轨跟踪性,则诱 导映射ｆ∞也具有伪轨跟踪性．并构造了一个例子说明它的逆命题不成立．还证明了零维紧致度量群 的自同构拓扑共轭于一族有限型子转移生成的逆极限系统．     

一列连续映射的动力学与不可分解性

在本文中我们讨论一列连续映射的动力学性质与其逆极限空间的拓扑结构间的关系并证明：一个可链体的约束映射具有广义马蹄的充要条件是此可链体含有不可分解子连续统．此结果推广了前人的相关工作     

对合Quantale同余关系

给出对合Quantale同余的概念,得到了对合Quantale同余的一些性质,讨论了对合Quantale同余与同态之间的关系,最后给出了对合Quantale乘积上的同余关系的结构。     

半环的L-模糊理想的范畴性质

首先给出了半环的L-模糊理想同态的定义,在此基础上较系统地讨论了半环的L-模糊理想范畴的性质,证明了此范畴是半环范畴上的一个拓扑结构,并探讨了其中的等子、拉回和乘积等性质.另一方面,给出了半环的L-模糊理想范畴的逆系统的定义,建立了半环的L-模糊理想范畴中逆系统的逆极限结构.特别是在引入两个逆系统之间映射的基础上,得到了两个逆系统的逆极限之间的极限映射.     

圆周上逆极限可扩的连续自映射

本文研究了圆周上一类自映射ｆ的正向可扩性与其道极限的可扩性间的联系，得出圆周上的连续满射ｆ的逆极限可扩等价于ｆ拓扑共轭于扩张映射．     

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.