title: [Development of intellectual deficiencies during operational learning. Conservation of continuous quantities. Conservation of discrete quantities].
mesh_terms: D002648:Child; D005260:Female; D006801:Humans; D008607:Intellectual Disability / Q000209:etiology*; D007360:Intelligence; D007858:Learning; D008297:Male; D008433:Mathematics; D008606:Mental Processes; D008722:Methods
vernacular_title: Evolution des déficiences intellectuelles au cours d'un apprentissage opératoire. La conservation des quantités continues. La conservation des quantités discrètes