Ibn al-Majdi

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

Ibn al‐Majdī
Born	1359 Cairo, Mamluk Sultanate, now Egypt
Died	27 January 1447 (aged 88) Cairo, Mamluk Sultanate, now Egypt
Occupation(s)	Astronomer, mathematician, engineer, grammarian, faqih, calendars
Era	Mamluk era (Islamic Golden Age)