ʿAbd Allāh ibn al-Ḥasan al-Ḥāsib was an

astronomer An astronomer is a scientist in the field of astronomy who focuses their studies on a specific question or field outside the scope of Earth. They observe astronomical objects such as stars, planets, moons, comets and galaxies – in either ...

and

mathematician A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems. Mathematicians are concerned with numbers, data, quantity, structure, space, models, and change. History On ...

who lived in the first half of the 10th century. Ibn an-Nadīm lists the following titles by him: #''Kitāb fī Ṣunūf aḍ-ḍarb wa-l-qisma'' ("Book on the Art of Multiplication and Division") #''Šarḥ kitāb Muḥammad ibn Mūsā al-Ḫwārizmī fi l-ğabr'' ("Commentary on the Book of Muḥammad ibn Mūsā al-Ḫwārizmī on Algebra") #''Šarḥ kitāb Muḥammad ibn Mūsā al-Ḫwārizmī fi al-ğamʿ wa-t-tafrīq'' ("Commentary on the Book of Muḥammad ibn Mūsā al-Ḫwārizmī on Addition and Subtraction")

References

*Fuat Sezgin. ''Geschichte des Arabischen Schrifttums - Band V: Mathematik''. Leiden, E. J. Brill, 1974. 10th-century mathematicians Astronomers from the Abbasid Caliphate Mathematicians from the Abbasid Caliphate Year of birth missing Year of death missing Astronomers of the medieval Islamic world {{Astronomer-stub