PREVIEW
... ions to Xu Yun:
Jia Xian is advanced in age, and what he studies daily are relatively profound mathematical problems, not swayed by money.
To persuade him to come to Bianjing to help, they must present something compelling enough to entice him.
Therefore, when choosing what to write in the letter.
Xu Yun could only rack his brains to include the knowledge Jia Xian might be most interested in.
Such as yin-yang... which is the odd-even changes, a few binomia ...
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