Abstract
The discovery of a procedural genre: the writing of a program of construction in geometry. The writing of a program of geometrical construction is a particular kind of task in so far as it requires the respect of some strict expectations in addition to mathematical work. Thanks to analysis of in-class sessions in primary school, we wonder how three pupils with difficulties appropriate these expectations and succeed in (or do not succeed in) overcoming various obstacles in order to enter in this specific genre.
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