Textbooks using mathematics in the margins of current mathematics: manuals for teaching inheritance in Morocco

Nowadays in Morocco, the distribution of inheritance is part of the basic juridical-religious curriculum taught in high school and in some branches of humanities and social sciences in higher education. This question of inheritance is, in fact, a taught discipline - called cilm al-farā'iḍ (lit. science of prescriptions) - with its own textbooks and its own teachers. In their presentation of the mathematical aspect related to this question of inheritance, these textbooks implement mathematics which uses a language and a vocabulary specific and different from those conveyed in modern mathematical teaching. In this paper we try to shed some light on this mathematical practice and highlight some of its peculiarities. For this, we present some textbooks for the teaching of this discipline by focusing on their mathematical content. We will also highlight the basic features of mathematics conveyed by these textbooks and their differences with current mathematics. Keywords: Inheritance problems, vocabulary, fraction, resolution process, manuals.