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Ahmad ibn Yusuf
Abu Ja'far Ahmad ibn Yusuf ibn Ibrahim ibn Tammam al-Siddiq Al-Baghdadi (835–912), known in the West by his Latinized name Hametus, was an Arab mathematician, like his father Yusuf ibn Ibrahim ((アラビア語:يوسف بن ابراهيم الصدَيق البغدادي )).
== Life ==
Ahmad ibn Yusuf was born in Baghdad and moved with his father to Damascus in 839. He later moved to Cairo, but the exact date is unknown: since he was also known as ''al-Misri'', which means ''the Egyptian'', this probably happened at an early age. Eventually, he also died in Cairo. He probably grew up in a strongly intellectual environment: his father worked on Mathematics, Astronomy and Medicine, produced astronomical tables and was a member of a group of scholars. He achieved an important role in Egypt, which was caused by Egypt's relative independence from the Abbasid Caliph.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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