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'.
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