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What are China's achievements in mathematics?
China's achievements in ancient mathematics are world-famous. The following are some examples of China's mathematical achievements:

1. Arithmetic: Arithmetic developed very early in ancient China, and the concept of decimal was put forward, and complex operations were carried out by using operational chips.

2. Nine Chapters Arithmetic: This is one of the most important mathematical works in ancient China, which systematically summarizes the ancient arithmetic and algebraic methods.

3. Solution of quadratic equation: The solution of quadratic equation appeared for the first time in China's ancient Sunzi Suanjing.

4. Infinite series: Qin, a mathematician in the Song Dynasty, put forward the concept of infinite series for the first time, which is considered to be the earliest infinite series in the world.

5. Four algorithms of equations: Liu Hui, an ancient mathematician in China, put forward four algorithms of equations, which became the basis of later algebra.

6. Sum formula of arithmetic progression and proportional sequence: Ancient Chinese mathematicians Qin and Yang Hui put forward the sum formula of arithmetic progression and proportional sequence respectively.

7. High-precision calculation: In ancient China, there was a demand for high-precision calculation, and methods such as "abacus calculation" were used for high-precision calculation.

These achievements showed China's outstanding contribution in the field of ancient mathematics, which laid the foundation for the later development of mathematics.