Description:
This paper aims to show that some mathematical objects present difficulties of understanding and use, and that this situation may have a direct impact on the pupils’ work and their learning. For this purpose, a thorough analysis of two questions put by pupils of secondary school on an Internet forum was carried out. That kind of forums was conceived to help them and to accomplish their school tasks (exercises, homework, revisions, etc.). Finally, the need felt in the domain of mathematics teaching for specific theories and approaches which enable to analyze the mathematical contents was underlined.