函数语言的名称源于这样一种概念：程序行为应该像数学函数一样；换句话说，给定一组输入，函数应始终返回相同的输出。
Functional languages get their name from the concept that programs should behave like mathematical functions; in other words, given a set of inputs, a function should always return the same output.
函数性编程范式使用数学函数表达程序。
The functional-programming paradigm uses mathematical functions to express programs.
称作Haskell的函数式编程语言展示了一个用于符号数学的程序，名为DoCon。
The functional programming language known as Haskell features a program for symbolic mathematics known as DoCon.
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