本文介绍克氏记号的主要性质,求法以及Gauss方程的四种形式。关键词:克氏记号,张量,Gauss方程。......

In this paper we address the implementation issue of the geodesics method with constraints on Heisenberg manifolds. Firs......

The objective of this paper is to review the lifespan model. This paper will also suggest four additional general altern......