The paper focuses on analysis of online discursive interactions among students from the first years of high school in problem-solving situations requiring the production of conjectures, arguments, and proofs. The study is framed in Vygotskian perspective, focusing on the language used to communicate and to manipulate and solve the tasks. We refer to the one-line proof model in order to analyze the students’ path towards argumentation and proof and to discuss the outcomes of an experiment.
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