The five sons of the Northern Song Dynasty were Zhou Dunyi, Shao Yong, Zhang Zai, Cheng Hao and Cheng Yi. Among them, Zhou Dunyi was the founder of Neo Confucianism in China, Zhang Zai was the founder of Guan studies, Cheng Hao and Cheng Yi's compatriots and brothers were "Er Cheng". Shao Yong was a philosopher of the Northern Song Dynasty and wrote books such as "internal and external articles of observing things".
The five sons of the Northern Song Dynasty are Zhou Dunyi, Shao Yong, Zhang Zai, Cheng Hao and Cheng Yi. Among them, Zhou Dunyi is the founder of Neo Confucianism in China. His works include Tong Shu and Tai Chi Tu Shuo. His theory of loving lotus is also a text that many people have studied.
Shao Yong was a philosopher of the Northern Song Dynasty. He wrote Huangji Jingshi, observing things inside and outside, etc. He has his own complete view of the universe and believes that history evolves according to a fixed number. Zhang Zai was the founder of Guan Xue and the founder of Neo Confucianism. He wrote zhengmeng, Ximing and other books.
Cheng Hao and Cheng Yi are compatriots and brothers. They are commonly known as "Er Cheng". Their theories were later inherited and developed by Zhu Xi. Cheng Hao wrote qualitative books, Zhiren articles and other books, and Cheng Yi wrote Yi Zhuan, Yichuan anthology and other books.