Chapter 55 Supplementary picture

Oracle Digital

Western Han Metal Counting Chips Unearthed in Xi'an

The original text of Liu Hui's cutting circle technique ("Nine Chapters of Arithmetic" engraved in Song Dynasty)

Guo Shuchun's "Nine Chapters on Arithmetic"

Ancient Diorama Zuo Mouhe Square Cover

The ancient three-dimensional model lowers the left turtle, lowers the Zhongyang horse, lowers the right temporary block

The three-dimensional decomposition of Zu Chongzhi's Kaili circle technique

The Duke of Zhou wrote the nine-chapter method to teach the map of the world (Huang Longyin's "Algorithm Guide" is clearly engraved)

The Shadow of Nine Chapters of Shushu by Qin Jiushao in the Southern Song Dynasty (Qing Yijiatang Edition)

Southern Song Dynasty Yang Hui's "Detailed Explanation of Nine Chapters Algorithm" (Qing Yijiatang Edition)

Ming Dynasty "Yongle Dadian" contains Jia Xian's triangle map

Western Han Bone Counting Chip Unearthed in Qianyang

Ming Dynasty Ivory Abacus

abacus

Song engraved arithmetic

Volume 1 of "Nine Chapters on Arithmetic" engraved in Song Dynasty

The portrait of Cheng Dawei in the Ming Dynasty (Kangxi block edition "Algorithm Tongzong")

Li Shanlan Statue in Qing Dynasty ("Gezhi Compilation")