Proper-Time Classical Electrodynamics

We construct a generalization of Maxwell's equations associated with the proper-time of the source which accounts for radiation reaction without any assumptions concerning the nature of the source. The theory leads to a new invariance group, related to the Lorentz group, which leaves the proper-time of the source fixed for all observers.     

图的距离不大于β的任意两点可区别的边染色

本文提出了图的距离不大于β的任意两点可区别的边染色,即D(β)-点可区别的边染色(简记为D(β)-VDPEC)．并得到了一些特殊图类,如圈、完全图、完全二部图、扇、轮、树以及一些联图的D(β)-点可区别的边色数,文后提出了相关的猜想．     

A Nonexistence Theorem of Proper Harmonic Morphisms Between Hyperbolic Spaces

We provide a nonexistence theorem of harmonic morphisms between hyperbolic spaces which are proper and C ²-smooth to the boundary.     

Optimal monitoring network designs

The selection of a monitoring network is formulated as a decision problem whose solutions would then be optimal. The theory is applied where the underlying field has a multivariate normal probability structure.     

论高校提高管理水平与人才培养的关系

育人为本,是社会主义大学不可动摇的办学理念,而管理育人则是育人的重要途径和学校德育的重要组成部分.要做好管理育人工作必须转变教师的管理育人观念,提高管理育人素质,科学管理、科学育人.     

On a domination property for vector maximization with respect to cones

We give a corrected version of Theorem 2.1 of Ref. 1.The author is indebted to D. T. Luc, Hungarian Academy of Sciences, Budapest, Hungary, for pointing out his error in the proof of the original version of Theorem 2.1 in Ref. 1.     

Controllability of delay systems with restrained controls

Using a geometric growth condition, we characterize both the function space and Euclidean controllability of a nonlinear delay system which has a compact and convex control set. This extends analogous results for ordinary differential systems, and it yields conditions under which perturbed nonlinear delay controllable systems are controllable.This research was supported by the National Aeronautics and Space Administration under Contract No. NSG 1445Now on leave of absence as Professor, Department of Mathematics, University of Jos, Jos, Nigeria.     

可定向把体中的Seifert曲面与偶曲线组

本文给出了可定向把体V的边界上一组互不相交的简单闭曲线界定V中一个Seifert曲面的同调特征。     

图K_（3,3）∨K_t的点可区别正常边染色

图G的正常边染色称为是点可区别的,如果对G的任意两个不同的顶点u,v,与u关联的边的颜色构成的集合异于与v关联的边的颜色构成的集合。对图G进行点可区别正常边染色所需要的最少颜色数称为是G的点可区别正常边色数,记为χ＇s（G）。讨论了图K3,3∨Kt的点可区别正常边染色。     

关于右型B半群的真覆盖

给出了右型B半群真覆盖的定义. 证明了相应于一右型B半群的任意真覆盖为作用于左消去幺半群上的相应于该右型B半群的真覆盖,并给出了相应于右型B半群的真覆盖的结构定理.