= 9th-century mathematicians
{wiki=Category:9th-century_mathematicians}
The 9th century was a significant period for mathematics, particularly in the Islamic world, where scholars made substantial contributions that influenced both the development of mathematics and its transmission to Europe. Here are some notable mathematicians and contributions from the 9th century: 1. **Al-Khwarizmi**: Perhaps the most famous mathematician of the 9th century, Al-Khwarizmi is often referred to as the "father of algebra.
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