Tsu

Tsu Ch'ung Chi

Born: 430 in Fan-yang (now Hopeh), China
Died: 501 in China

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Tsu qave the rational approximation 355/113 to pi which is correct to 6 decimal places. He also proved that

3.1415926 < pi < 3.1415927

a remarkable result on which it would be nice to have more details but Tsu Ch'ung Chi's book, written with his son, is lost.

References elsewhere in this archive:

Tell me about approximations for pi

References:

  1. Dictionary of Scientific Biography
  2. U Libbrecht, Chinese Mathematics in the Thirteenth Century (Cambridge, Mass., 1973), 275-276. 
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JOC/EFR February 1996