Yes Daxue, The Doctrine of the Mean, The Analects of Confucius and Mencius are all Confucian classics of China. They are also called "Four Books" because they are four representatives of early Confucianism, namely Confucius, Zeng Shen, Zi Si and Mencius. After a long period of baptism, the four books were compiled by Zhu, a famous scholar in the Southern Song Dynasty, and written as "Notes on the Four Books", which concentrated the true colors of gold and flourished for a time. The order of the four books compiled by Zhu was originally The University, The Analects of Confucius, Mencius and The Doctrine of the Mean, which was arranged in the order of learning from the shallow to the deep. Later generations put The Doctrine of the Mean before The Analects of Confucius because of its short space. In order to facilitate engraving and publishing, it became the order of The Doctrine of the Mean, The Analects of Confucius and Mencius.