The book Al-Muʻtamad fī ʻilm al-farāʼiḍ , written by the Moroccan writer MOHAMED MOATAMID ALALLAH , where the writer simplified this science, which is difficult for non-specialists, and so that the science is simple and the honorable reader does not find any difficulty in dealing with it. So the author reformulated science, and the adoption of a new unprecedented approach.