Ahmad ibn Ibrahim ibn Ali ibn Munim al-Abdari (Arabic:
أحمد بن ابراهيم بن علي بن منعم الأبداري; died 1228) was a mathematician,
originally
from Dénia in Andalusia. He lived and taught in Marrakesh where he was known as
one of the best scholars in geometry and number theory. He is often confused
with Muhammad ibn 'Abd al Mun'im, a different mathematician who worked in the
court of Roger II of Sicily.
Only three of his many mathematical texts are known
today; one on magic squares, one on geometry and one on the science of
calculation. Only the last, Fiqh al-hisab is extant. It is the first book in
the history of mathematics to devote a whole chapter to combinatorial problems.
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Mathematician
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