In this important article, Professor Ahmed Djebbar, the renowned scholar and specialist of the history of Arabic sciences, especially in the Islamic West, presents a general survey on mathematical activities in the Medieval Maghrib since the 9th century. Relying on his own studies and on a direct knowledge of the original sources, the author draws a rich picture of scientific activity in the Islamic west and thus shows the importance of the contribution of Maghribi mahematicians to the Arabic and Islamic mathematical tradition.">