这种图解方法，叫做文氏图，这种图解方法，叫做文氏图，在集合论中常用于检验定理的有效性或者为证明定理提供一些潜在的方法。
Visual AIDS of this type, called Venn diagrams, are useful for testing the validity of theorems in set theory or for suggesting methods to prove them.
在讨论数学的任何分支时，无论是分析，代数或分析，利用集合论的记号和术语是有帮助的。
In discussing any branch of mathematics, be it analysis, algebra, or geometry, it is helpful to use the notation and terminology of set theory.
因为RDBMS是建立在严格的数学集合论基础上的，数据结构简单、清晰，具有强大的查询能力，RDBMS成为实现信息系统的基本技术。
RDBMS is based on firm mathematics set theory with simple and clear data structure, and powerful query function, so it has become the basic technology for realization of information system.
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