# Mathematician:Liu Hui

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## Mathematician

Chinese mathematician and writer.

Edited and published a book with solutions to mathematical problems presented in *Chiu Chang Suann Jing* ("Nine Chapters on the Mathematical Art"), in which he gave:

- a calculation of $\pi$ (pi) correct to $4$ decimal places
- proof of the formulae for the volume of the square pyramid and tetrahedron.

Possibly the first mathematician to discover, understand and use negative numbers.

## Nationality

Chinese

## History

- Born: about 220 or 225 in Wei, China
- Died: about 280 or 295 in China

## Theorems and Definitions

## Writings

- 263: Commentary on the
*Chiu Chang Suann Jing*("Nine Chapters on the Mathematical Art") - 263:
*Haidao Suanjing*("The Sea Island Mathematical Manual")

## Sources

- 1998: David Nelson:
*The Penguin Dictionary of Mathematics*(2nd ed.) ... (previous) ... (next): Entry:**Liu Hui**(*c*. ad 263) - 2008: David Nelson:
*The Penguin Dictionary of Mathematics*(4th ed.) ... (previous) ... (next): Entry:**Liu Hui**(*c*. ad 263)