"Les situations de validation vont mettre en présence deux joueurs qui s'affrontent à propos d'un objet d'étude composé des messages et descriptions que l'élève a produits d'une part, et du milieu a-didactique qui sert de référent à ces messages d'autre part. Les deux joueurs sont alternativement un 'proposant' et un 'opposant' ; ils échangent des assertions, des preuves et démonstrations à propos de ce couple 'milieu/message'." (Brousseau 1986 p.108)
• English : Situation of validation (proof)
"These are the ones that make the mathematical reasoning of the students most visible, as they produce arguments addressed to their peers with the goal of convincing them. It's a matter of inciting the students to become skeptical about some precise mathematical notion and of giving them a motive and the means not just to check the validity but beyond that to convince the other students." (Brousseau et al. 2014 p.151)
• English : Situation of validation (proof)
"These are the ones that make the mathematical reasoning of the students most visible, as they produce arguments addressed to their peers with the goal of convincing them. It's a matter of inciting the students to become skeptical about some precise mathematical notion and of giving them a motive and the means not just to check the validity but beyond that to convince the other students." (Brousseau et al. 2014 p.151)
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