The terms "yuan" and "times" in mathematical equations were created by Emperor Kangxi of the Qing Dynasty. When missionaries explained mathematical equations to Kangxi, they often couldn't explain them clearly because of their limited translation level. Emperor Kangxi suggested that the unknown be translated into yuan, and the highest number into times, so that the values of the unknown equal to the left and right sides of the equation can be translated into roots or solutions.

Kangxi's life:

Emperor Aisingiorro Michelle Ye (1654 ——1February 20th, 722), namely Emperor Kangxi, the fourth emperor in Qing Dynasty and the second emperor after the capital. Kangxi years: health, peace; Xi, prosperity, takes the meaning of all people's corning and the prosperity of the world. Mongolians call Enkh A Mu Gulangyan or A Mu Gulangyan. He ascended the throne at the age of 8, ruled at the age of 14, and reigned for 6 1 year. He was the longest reigning emperor in China. He was the defender of China's unified multi-ethnic country, laid the foundation for the prosperity of the Qing Dynasty, and created the prosperous times of Kanggan. Posthumous title Yun, a civil servant, is diligent and thrifty, and respects the integrity, merits and greatness of the emperor.