= 9th-century mathematicians by nationality
{wiki=Category:9th-century_mathematicians_by_nationality}
In the 9th century, notable mathematicians emerged from various cultural and geographical backgrounds, particularly within the Islamic world and Europe. Here's a brief overview by nationality or region: \#\#\# Islamic World 1. **Al-Khwarizmi** (Persian) - Often hailed as the "father of algebra," Al-Khwarizmi's works were foundational in developing algebra and introducing the decimal positional number system to the West.
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