A proof is a device for convincing someone else that a mathematical statement is true.
证明是一种用于使他人相信数学陈述为真的工具。
模糊集的概念提供了一种自然的方式来处理那些不精确性源于缺乏明确定义的类别成员标准的问题。
In every person, there is an abyss. Sometimes you look into it, and sometimes you don’t.