劉徽的成就,除了圓周率算法,求解線性方程組(高斯消元法),等冪等積定理,更偉大的是(據English Wiki)

Through his work in the Nine Chapters, he could have been the first mathematician to discover and compute with negative numbers; definitely before Ancient Indian mathematician Brahmagupta (排23)started using negative numbers.

劉徽生活的魏晉時期,社會動亂但思想活躍。以後中國數學就走下坡路了。

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