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我们知道,命题是逻辑的最基本的概念;使命题p(x)为真的元素构成的集合P,用描述法表示为P={x|p(x)},可简记为P={x|p}.由此可见,命题与集合
We know that the proposition is the most basic concept of logic; the set P of the elements of the mission problem p(x) is expressed by the descriptive method as P={x|p(x)}, which can be abbreviated as P={ x|p}. Thus, propositions and collections