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Where does Huang Zongxi, a beginner in the late Ming and early Qing Dynasties think western geometry came from?
A Study of Pythagoras in Zhouyi ·suan Jing.

Zhou Bi Su 'an Jing, formerly known as Zhou Bi Su 'an Jing, is one of the ten books of Calculation Jing. It is the oldest work on astronomy and mathematics in China, which was written in 1 century BC, mainly explaining the theory of covering the sky and the method of four seasons calendar at that time. In the early Tang Dynasty, it was stipulated as one of imperial academy's teaching materials, so it was renamed Zhou Kuai. The main achievement of Zhou Pian Suan Jing in mathematics is to introduce and prove Pythagorean theorem.

The book "Parallel Calculation of Weeks" adopts the simplest and feasible method to determine the astronomical calendar, and reveals the operating rules of the sun, the moon and the stars, including the changes of seasons and climate, as well as the fact that the north and south poles push each other day and night. It provides a powerful guarantee for the life and rest of the latecomers. Since then, mathematicians of all ages have been innovating and developing on the basis of the Classic of Weekly Parallel Computing.

Extended data:

Zhou Kuai Shu Jing Shi;

According to textual research, Zhou pian Shu Jing was written in the Western Han Dynasty (BC 1 century). The prints handed down in the Southern Song Dynasty (12 13) are the earliest prints handed down at present. Many mathematicians in the past dynasties have annotated this book, the most famous of which is the annotation by Feng Chun and others in the Tang Dynasty. The classic of parallel week calculation has also spread to South Korea and Japan, where there are also many inscriptions.

Judging from the content of mathematics, the book mainly tells the method of learning mathematics, using Pythagorean theorem to calculate abstruse distance and complex fraction calculation.