新三维混沌系统及其电路仿真实验

提出了一个混沌系统，并对该系统的基本动力学特性进行了深入研究.得到该系统的Lyapunov指数、Lyapunov维数，给出了Poincaré映射图以及时域图和相图. 运用电子工作平台EWB软件对实现该新混沌系统的振荡器电路进行了仿真实验. 经过数值仿真和电路系统仿真证实该系统与以往发现的混沌吸引子并不拓扑等价，属于新的混沌系统. 关键词： 混沌系统 动力学行为 电路实现     

On formally real modules

The aim of this paper is to develop the study of modules in real algebra. By introducing two kinds of reality for modules over commutative rings, we establish some results on semireal modules and real modules. Our results involve real radicals of submodules and orderings on modules.     

Invariant Ideals and Matsushima's Criterion

Let G be a reductive algebraic group over an algebraically closed field  of characteristic zero and H a closed subgroup of G. Explicit constructions of G-invariant ideals in the algebra [G/H] are given. This allows to obtain an elementary proof of Matsushima's criterion: the homogeneous space G/H is an affine variety if and only if H is reductive.     

Refinement of Ado's Theorem in Low Dimensions and Application in Affine Geometry

In this article, we construct a faithful representation with the lowest dimension for every complex Lie algebra in dimension ≤ 4. In particular, in our construction, in the case that the faithful representation has the same dimension of the Lie algebra, it can induce an étale affine representation with base zero which has a natural and simple form and gives a compatible left-symmetric algebra on the Lie algebra. Such affine representations do not contain any nontrivial one-parameter subgroups of translation.