Al-Khwarizmi

Muhammad ibn Musa al-Khwarizmi was a Persian scholar who worked in Baghdad in the 9th century, probably under the Abbasid caliph al-Ma'mun. He is associated with the scholarly milieu known as the House of Wisdom, although its exact nature is debated. His work covered mathematics, astronomy, geography, and calendar studies.

In his treatise on solving equations, known as Al-Kitab al-Mukhtasar fi Hisab al-Jabr wal-Muqabala, he set out systematic methods for solving linear and quadratic equations. The Arabic term al-jabr, linked to restoring or balancing terms, later gave rise to the word "algebra" through medieval translations. Al-Khwarizmi also played an important role in the history of calculation.

In a work on Indian numerals and arithmetic, he explained procedures based on the decimal positional system, helping transmit mathematical knowledge from India into the Islamic world and later into Europe. He did not invent the numerals themselves, and later developments of the decimal system cannot all be credited to him.

His name, Latinized as "Algoritmi", eventually gave rise to the word "algorithm", reflecting his influence on systematic calculation. He also produced astronomical tables and a geographical work listing coordinates for many places. His writings were translated into Latin in medieval Europe and became important sources for the development of European mathematics.