The representative course of knowledge is a course in which the information state changes from self presence to self performance and an extensible thinking process of meta language.
知识表现的过程是信息由“自在”状态进入“自为”状态的过程，也是元语言的思维扩展过程。
Problem is the heart of mathematics and mathematics is the exercise of thinking training. Thinking is the core of cognition, while meta-cognition is the important component of thinking.
问题是数学的心脏，数学是锻炼思维的体操，思维是认知的核心，元认知是思维的重要监控成分。
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