Born on 1412

Died on 1486

Abū al-Ḥasan ibn ʿAlī ibn Muḥammad ibn ʿAlī al-Qalaṣādī;

(Arabic: أبو الحسن علي بن محمد بن علي القرشي البسطي‎; 1412–1486) was a Muslim Arab mathematician from Al-Andalus specializing in Islamic inheritance jurisprudence. Al-Qalaṣādī is known for being one of the most influential voices in algebraic notation since antiquity and for taking “the first steps toward the introduction of algebraic symbolism”. He wrote numerous books on arithmetic and algebra, including al-Tabsira fi’lm al-hisab (Arabic: التبصير في علم الحساب‎ “Clarification of the science of arithmetic“).



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