Looking for regular polyhedrons
The article introduces a research built around the resolution of a complex problem of geometry in space. First, the didactic situation is the object of an epistemological investigation as to the anchoring of the mathematical objects under study. This is followed by a confrontation with classroom reality in a specific environment. The robustness of the situation is tested in a specialized education context and it guarantees the development of student access to knowledge as well as teacher professional development. The article concludes with an analysis of the environment-related components, and it derives some didactic invariants.