# Al-Kindi

**Abu Yusuf Yaqub ibn Ishaq al-Sabbah Al-Kindi** (

801 -

873) worked with

Al-Khawarizmi and the Banu Musa Brothers to translate

Greek scientific manuscripts in the "

House of Wisdom" in

Baghdad. In addition, Al-Kindi wrote many manuscripts and books of his own. Topics for these manuscripts included:

- Indian numbers
- The harmony of numbers
- Lines and multiplication with numbers
- Relative quantities
- Numerical procedures and cancellation
- The theory of parallel lines (and in particular lines which are non-intersecting and non-parallel)

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