The article provides more than four types of definitions of Diracfunction, and has studied various natures of Diracfunction.
从各种不同角度给出了狄拉克函数四种以上的定义，同时还研究了狄拉克函数的各种性质。
2
The wave function of free electron in a strong laser plasma is obtained by solving exactly the Dirac equation in a curved space-time with optical metric for the laser plasma.