本文以系统抽象法为基本方法，坚持历史与逻辑的统一，详细占有资料。

This paper employs systematic abstract method, persisting in the unity of history and logic with possession of detailed information.

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本文梳理了由二分法思维习惯向阴阳爻、奇偶数、阴阳概念逐步抽象的历史和逻辑的进程。

I comb out the course of history developing from the primitive thinking to divided and undivided lines, then to odd and even numbers, and then to Yin and Yang.

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