Ibn al-Majdi

Ahmad bin Rajab bin Taibugha al-Majdī al-ala’i bin Abdullah Shihāb al‐Dīn Abu al-Abbas (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'.