《河图》五行数与《周易》四象数之间的关系

<河图>的五行成数不能与<周易>四象数混同."六、七、八、九"四数在<周易>与<河图>中的含义并不一致;五行成数实际存在两种说法,先秦文献中使用的土的成数是"五",而不是"十",因而五行数到"九"为止;土有成数"十"最初见于汉代,实际是五行学说在<易>理指导下发展的产物.

The correlation between the five-element numbers of Hetu and the four-image numbers of Zhouyi

The five-element numbers of Hetu should not be confused with the four-image numbers of Zhouyi. The four numbers of "6, 7, 8, 9" differs in denotations in Zhouyi and Hetu. There actually exist two statements on the five-element numbers, the number for "earth" in the documents of the pre-Qin times is "5" but not" 10", thus the five-element numbers is from "1" to "9". "10" as a number for "earth", which was a developed result of the five - element element theory guided by principles of I, originally appeared in the Han Dynasty.