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程序始于基本数学过程的随机组合——加、减、乘、除和一些代数运算。

The program started with near-random combinations of basic mathematical processes - addition, subtraction, multiplication, division and a few algebraic operators.

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为这些任务而设计的程序领域的最常用名称是“计算机代数系统”(Computer Algebraic Systems, CAS)。

The most common designation for the field of programs designed for these tasks is computer algebraic systems (CAS).

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Now, unlike high school math or in algebra Z where you call things X and Y and Z, in programming, in computer science, you're actually dealing with humans where it's useful to have a variable name that's more descriptive than X and Y and Z.

不像高中数学或者代数中,称为X和Y和，在程序设计和计算机科学里，你实际上是在和人打交道,在这里有个描述性比xyz更强的,变量名称是很重要的。

哈佛公开课 - 计算机科学课程节选