The 9th-Century Baghdad Mathematician Whose Name Became the Word 'Algorithm' and Whose Book Title Became 'Algebra'
Muhammad ibn Musa al-Khwarizmi worked at the House of Wisdom in Baghdad under Caliph al-Ma'mun in the 820s. His *al-Kitāb al-mukhtaṣar fī ḥisāb al-jabr wa-l-muqābala* gave Europe the word algebra. The Latinised version of his name — algoritmi — gave Europe the word algorithm. He introduced the Hindu decimal numeral system to the Arabic-speaking world and from there to Europe.
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