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。
The article provides more than four types of definitions of Dirac function, and has studied various natures of Dirac function.
到了早晨，他已经证实了一类富克斯函数的存在。
When morning came, he had established the existence of one class of Fuchsian functions.
系统的哈密顿函数是作为矩阵微分算子的狄拉克算子，它不是半有界的。
The Hamiltonian of the system is the Driac operator which as a matrix differential operator is not semibounded from below.
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