Ahmad bin Rajab bin Taibugha al-Majdī al-ala’i bin Abdullah Shihāb al‐Dīn Abu al-Abbas (Egyptian Arabic: أحمد بن رجب بن طيبغا المجدي العلائي بن عبد الله شهاب الدين أبو العباس; 1359–1447 CE) was an Egyptian mathematician and astronomer. His most important mathematical work was "Book of Substance", a voluminous commentary on the Summary of the Operations of Calculations by Ibn al-Banna'.^[1]

• Charette, François (2007). "Ibn al‐Majdī: Shihāb al‐Dīn Abū al‐ʿAbbās Aḥmad ibn Rajab ibn Ṭaybughā al‐Majdī al‐Shāfiʿī". In Thomas Hockey; et al. (eds.). The Biographical Encyclopedia of Astronomers. New York: Springer. pp. 561–2. ISBN 9780387310220. (PDF version)