Ibrahim ibn Sinan (Arabic: Ibrāhīm ibn Sinān ibn Thābit ibn Qurra, ; born 295296 AH/ in Baghdad, died: 334-335 AH/946 in Baghdad, aged 38) was a mathematician and astronomer who belonged to a family of scholars originally from Harran in northern Mesopotamia. He was the son of Sinan ibn Thabit (943) and the grandson of Thābit ibn Qurra (901). Like his grandfather, he belonged to a religious sect of star worshippers known as the Sabians of Harran. Ibrahim ibn Sinan studied geometry, in particular tangents to circles. He made advances in the quadrature of the parabola and the theory of integration, generalizing the work of Archimedes, which was unavailable at the time. Ibrahim ibn Sinan is often considered to be one of the most important mathematicians of his time. Notes Sources (PDF version) Further reading Reviews: Seyyed Hossein Nasr (1998) in Isis 89 (1) pp. 112-113; Charles Burnett (1998) in Bulletin of the School of Oriental and African Studies, University of London 61 (2) p. 406. 900s births 946 deaths Year of birth uncertain 10th-century Arabs 10th-century people from the Abbasid Caliphate 10th-century mathematicians 10th-century astronomers Geometers People from Baghdad Mathematicians from the Abbasid Caliphate Astronomers from the Abbasid Caliphate Astronomers of the medieval Islamic world Sabian scholars from the Abbasid Caliphate