Addition, subtraction, multiplication, and division are binary operations.
加、减、乘、运算。
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A typical course starts with this very formal and abstract definition, which is that a group is a set – any collection of things – with a binary operation – a notion of multiplication between those things – such that this multiplication satisfies four special rules, or axioms.
典型的课程从正式和抽象的定义开始,即群是一
集合(任何事物的集合), 具有二元运
(
事物之间的乘法概念), 使得
种乘法满足四
特殊规则或公理。