Abū Manṣūr ʿAbd al-Qāhir ibn Ṭāhir bin Muḥammad bin ʿAbd Allāh al-Tamīmī
al-Shāfiʿī al-Baghdādī (Arabic: أبو منصور
عبدالقاهر ابن طاهر بن محمد بن عبدالله التميمي الشافعي البغدادي) was an Arab Shafi'i scholar, Usul Imam, heresiologist
and mathematician.
Early life and education
'Abd al-Qahir al-Baghdadi was born and raised in Baghdad. He was a member
of the Arab tribe of Banu Tamim. He received his education in Nishabur and
subsequently taught 17 subjects, including law, usul, arithmetic, law of
inheritance and theology. Most of the scholars of Khurasan were his pupils. Ibn
'Asakir writes that Abu Mansur met the companions of the companions of Imam
al-Ashari and acquired knowledge from them.
Works
'Abd al-Qahir al-Baghdadi wrote several books including Usul al-Din, a
systematic treatise, beginning with the nature of knowledge, creation, how the
Creator is known, His attributes, etc.... and al-Farq bayn al-Firaq which takes
each sect separately, judges all from the standpoint of orthodoxy and condemns
all which deviate from the straight path. Both books were major works on the beliefs
of Ahl al-Sunna.
He also wrote the treatise al-Takmila fi'l-Hisab which contains results in
number theory, and comments on works by al-Khwarizmi which are now lost.
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Mathematician
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