Ezra
# Abraham ben Meir ibn Ezra

### Born: 1092
in Toledo, Emirate of Saragossa (now Spain)

Died: 1167
in Calahorra, Spain

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**Rabbi Ben Ezra** wrote 3 treatises on numbers. One describes the decimal system for integers with place values from left to right and zero is called galgal (meaning wheel or circle).
He translated al'Biruni's commentary on al'Khwarizmi's tables and made interesting comments on the introduction of Indian mathematics into Arabic science in the 8th Century. He also wrote on permutations and combinations, astrology, poetry and Biblical studies.

**References (5 books/articles)**

**References elsewhere in this archive:**

There is a **Crater A ben Ezra** on the moon. You can see a list of lunar features named after mathematicians.

JOC/EFR December 1996