二重积分的概念 concept of double integration ; Concept of Double Integral
二分概念
Binary concept
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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