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Abu Bakr al-Hassar

Moroccan mathematician
Al-Hassar or Abu Bakr Muhammad ibn Abdallah ibn Ayyash al-Hassar was a 12th-century Moroccan mathematician. He is the author of two books Kitab al-bayan wat-tadhkar, a manual of calculation and Kitab al-kamil fi sinaat al-adad, on the breakdown of... Wikipedia