1260 — Al-Farisi gave a new proof of Thabit ibn Qurra's theorem, introducing important new ideas concerning factorization and combinatorial methods.
Al-Jurjānī was influenced by his predecessors such as the grammarian Sibawayh, the critic Abi Helal al-'Askari al Balaghi, and the linguist and literary theorist Abu Ali al-Farisi, known for his book al-Idah (Elucidation).