《Discrete Mathematic with Applications》读书笔记（五）
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Chapter5 SET THEORY
5.1 Basic Definitions of Set Theory
The axiom of extension says that a set is completely determined by its elements; the order in which the elements are listed is irrevlevant, as is the fact that some elments may be listed more than once.
The def of set:
{a, b, c} {a, b}
A = {x in S| p(x)}
Subsets
真子集
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