1δ-函数的定义有一种函数很奇特,它与古典的“一点对应一点”的函数定义不相符,因而曾一度被数学家拒之门外,直到20世纪40年代引进广义函数的概念后,才被数学界所承认.这就是以英国物理学家狄拉克(Dirac)名字命名的狄拉克函数,通常也叫δ-函数.δ-函数的定义为 The definition of the 1δ-function has a peculiar function that does not correspond to the classical definition of a function “a bit at a time” and was once rejected by mathematicians until the concept of generalized functions was introduced in the 1940s , Was recognized by the mathematical community.This is the Dirac function named British Dirac, also known as δ-function .δ-function is defined as