起源——知识凝聚函数观念古代早已有之,而函数概念则是由17世纪德国著名数学家莱布尼茨提出的,其定义的形成经历了五次变革:1689年,瑞士数学家约翰·贝努利在莱布尼兹函数概念的基础上,对函数概念进行了明确定义,他把变量x和常量按任何方式构成的量叫“x的函数”;18世纪中叶,欧拉给出作为解析式的函数的定义:一个变量的函数是由这个变量和一些数,即常数,以任何方式组成的解析表达式,他把约翰· Origin: The concept of knowledge aggregating function has long existed in ancient times, and the concept of function was proposed by the famous German mathematician Leibniz in the 17th century. Its definition has undergone five changes: In 1689, the Swiss mathematician John Bay On the basis of Leibnitz’s concept of functions, Nuley defined the concept of the function. He defined the variable x and the constant in any way called the “function of x”; in the middle of the 18th century, Euler gave Definition as an analytical function: a function of a variable is an analytical expression consisting of this variable and some number, that is, a constant, in any way, he put John