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Al khwarizmiHere is Mohammad Ibn Musa in a fictional pictorial representation from a book. Algebra, comes from the Arab word "aljabr", which means restitution, reunion, and it comes from a method called "aljabr wa'l muqâbala" (to calculate by means of shifting and recollecting  this is wat we do when we move equal symbols to the same part of an equation). He was maybe from the city of (Al)Kwarismi (today called Khiva or Khorazm, in Uzbekistan), a Persian scholar, and he is perhaps wrongly thought by many the "father" of algebra with his work "The book of Summary Concerning Calculating by Transposition and Reduction" written between ca. 813833 AD.
However, according to scholars, his way of dealing with "abstract" equations, unrelated to any practical problem, and then landing a general mathematical rule was absolutely new in Mathematics. See how many "probably" and "perhaps"? This is history as it is at his heart. Legends abounds (Galileo heroism against the Church, Nero's burning of Rome, Tommaso Moro's virtues...) (see more on the history of mathematics And here his biography.
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