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文[1]指出,一般的多元方程中,变量之间就有确定的隐函数关系(实解),变量的取值范围(实解集)是自然确定了的,只要能解出一个变量(分离变量)就得到一些显函数(解出的变量就表示含其余变量代数式的值,因此,显函数是特殊的多元方程,是代数式(代数式整体换元就是显函数,即一般的多元方程和代数式都是隐函数,即一般方程中分离变量就得显函数,代数式换元就得显函数),是多元
In [1], it is pointed out that in general multivariate equations, there is a definite implicit function relationship (real solution) between variables, and the range of values of a variable (set of real solutions) is naturally determined as long as one variable can be solved ( Separation of variables) yields some explicit functions (the variables that are solved represent algebraic expressions of the remaining variables. Therefore, the explicit function is a special multivariate equation, algebraic (algebraic integral substitutions are explicit functions, ie general multivariate equations and algebraic expressions). All of them are implicit functions, that is, the separation function of the general equation has an explicit function, and the algebraic equation change has an explicit function).