# Mathematician:Theon of Alexandria

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## Mathematician

Alexandrian mathematician and astronomer.

Best known for being the father of Hypatia of Alexandria.

His edition of Euclid's *The Elements* was an authority until well into the $19$th century.

Not to be confused with Theon of Smyrna, known as **Theon Senior** or **the old Theon**.

## Nationality

Alexandrian (a city in what is now Egypt).

## History

- Born: c. 335 CE, possibly in Alexandria, Egypt
- Died: c. 405 CE

## Publications

- c 364: Produced an edition of Euclid's
*The Elements*. - Produced commentaries on Euclid's
*Data*and*Optics*. - Produced a important commentary on Claudius Ptolemy's
*Almagest*, and two on his*Handy Tables*. - A detailed treatise on the astrolabe.
*Catoptrica*, which was at one point thought to have been written by Euclid.

## Also known as

In Greek: **Θέων**

## Sources

- John J. O'Connor and Edmund F. Robertson: "Theon of Alexandria": MacTutor History of Mathematics archive

- 1926: Sir Thomas L. Heath:
*Euclid: The Thirteen Books of The Elements: Volume 1*(2nd ed.) ... (previous) ... (next): Introduction: Chapter $\text{V}$. The Text - 1980: David M. Burton:
*Elementary Number Theory*(revised ed.) ... (previous) ... (next): Chapter $1$: Some Preliminary Considerations: $1.3$ Early Number Theory