Pretty (good) didactical provocation as a tool for teacher's training in geometry
Résumé
In this paper, we present, what we call in French PPD (Petites Provocations Didactiques) translated in English by Pretty (Good) Didactical Provocations. These teachers’ training situations try to provoke and destabilise the representations of future teachers on geometry. So they must realise the diversity of the geometrical paradigms. We suggest three examples intended to clarify the nature of the P(G)DP and the pertinence of this type of training situation. All the examples are taken in the geometrical frame: it is caused by the fact that the setting up of Didactical Provocations needs an epistemological and didactical analysis that we have made only for Geometry.