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- Abu_Bakr_al-Hassar abstract "Al-Hassar or Abu Bakr Muhammad ibn Abdallah ibn Ayyash al-Hassar was a Muslim mathematician from Morocco, living in the 12th century. He is the author of two books Kitab al-bayan wat-tadhkar (Book of Demonstration and Memorization), a manual of calculation and Kitab al-kamil fi sinaat al-adad (Complete Book on the Art of Numbers), on the breakdown of numbers. The first book is lost and only a part of the second book remains.Al-Hassar developed the modern symbolic mathematical notation for fractions, where the numerator and denominator are separated by a horizontal bar. This same fractional notation appeared soon after in the work of Fibonacci in the 13th century.".
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- Abu_Bakr_al-Hassar name "Hassar, Abubakr".
- Abu_Bakr_al-Hassar shortDescription "Moroccan mathematician".
- Abu_Bakr_al-Hassar description "Moroccan mathematician".
- Abu_Bakr_al-Hassar description "Moroccan mathematician".
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- Abu_Bakr_al-Hassar comment "Al-Hassar or Abu Bakr Muhammad ibn Abdallah ibn Ayyash al-Hassar was a Muslim mathematician from Morocco, living in the 12th century. He is the author of two books Kitab al-bayan wat-tadhkar (Book of Demonstration and Memorization), a manual of calculation and Kitab al-kamil fi sinaat al-adad (Complete Book on the Art of Numbers), on the breakdown of numbers.".
- Abu_Bakr_al-Hassar label "Abu Bakr al-Hassar".
- Abu_Bakr_al-Hassar label "أبو بكر الحصار".
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- Abu_Bakr_al-Hassar givenName "Abubakr".
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- Abu_Bakr_al-Hassar name "Abubakr Hassar".
- Abu_Bakr_al-Hassar name "Hassar, Abubakr".
- Abu_Bakr_al-Hassar surname "Hassar".