Al-Hassar or Abu Bakr Muhammad ibn Abdallah ibn Ayyash al-Hassar (Arabic: أبو بكر محمد ابن عياش الحصَار)
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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Mathematician
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