1, Pythagorean theorem (quotient height theorem). The inventor Shang Gao (from the Western Zhou Dynasty) was more than 550 years earlier than the second inventor Pythagoras (580-500 BC).

2. The discovery of negative numbers. This discovery was first seen in Nine Chapters Arithmetic, more than 600 years earlier than India and 1600 years earlier than the West.

3. The most accurate pi: 3. 14 15926