"The author addresses learners, commenting on each sentence of the book [by Ibn al-Bannāʾ], both linguistically and mathematically and complementing his explanations with references to other texts in the field. All of this provides information on the content of certain publications in al-Andalus and the Maghrib that were still in circulation during the lifetime of the author but are not known to be extant today" (Djebbar, EI3).