3.This thesis makes a thorough analysis of Plato's concept of Idea by referring to many important Plato's dialogues, with studying some other concepts, such as nous, noesis, auto, etc.
它作为事物之自身,乃是事物
本质,作为思维存在,乃是与事物之本质相应
思维之概念,而它同时又是事物
理想存在,构成了事物

,这样,它在根本上是本体论、逻辑学和
论三者
统一。