* 1412, † 1486
Abu’l Hasan ibn Ali al Qalasadi was born 1412 in Bastah (now Baza), Spain. Al-Qalasadi was a Spanish Islamic mathematician who took the first steps toward the introduction of algebraic symbolism by using letters in place of numbers. Abu’l Hasan ibn Ali al Qalasadi died in 1486 in Béja, Tunisia.
| | | | created: 2016-08-26 20:57:51 | modified: 2016-08-26 20:57:51 | by: bookofproofs | references: 
 O’Connor, John J; Robertson, Edmund F: “MacTutor History of Mathematics Archive”, http://www-history.mcs.st-and.ac.uk/, 2014