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“知识是什么？”的问题实质上是一个揭示知识概念的哲学认识论内涵、也即给“知识”一词以一个恰当的认识论定义的问题。因“知识”一词的本意是指主体（Ｓ）对一定对象（Ｐ）的知道，所以我们可以通过对“Ｓ知道Ｐ”的充分必要条件的分析来使这一问题得到正确的解决。根据本文的分析，Ｓ知道Ｐ的充分必要条件是：Ｓ知道Ｐ，当且仅当（１）Ｐ是真的；（２）Ｓ相信Ｐ；并且（３）Ｓ相信Ｐ被证明是合理的。从这一充分必要条件出发，本文把知识定义为“被证明的真信念”。本文对“知识是什么？”问题的回答是：知识是被证明的真信念。
The question of “what is knowledge?” Is essentially a philosophical epistemological connotation that reveals the concept of knowledge, that is, the question of defining the term “knowledge” with an appropriate epistemology. Since the original meaning of “knowledge” refers to the subject (s) 's knowledge of a certain object (p), we can correct the problem by analyzing the necessary and sufficient condition of “S knows p”. Based on the analysis in this paper, the sufficient and necessary condition for S to know P is: S knows P if and only if (1) P is true; (2) S believes P; and (3) S believes that P proves to be reasonable. Starting from this sufficient and necessary condition, this article defines knowledge as “proved true belief”. The answer to the question “what is knowledge?” Is that knowledge is the true belief that is proven.