“…This notation and the related conception of algebraic equation appear as the outcome of a long historical 11 See Ibn al-Haytham, 'Sur la cause de la racine, de son doublement et de son déplacement,' in Rashed (1993, 469-478). Hamouda and Hachaichi (2021) analyse this proof. 12 See Hebeisen (2009, part 1, 122, 123, 135-136) as well as al-Samawʾal's Al-Bāhir (for instance, Rashed 2021, 34-47).…”