In this paper, we analyzed the role of the explanations in a mathematics course on the first semester of engineering, when the variation notion is being used by the professor and at the time of which the students take part with it. In particular, we are focus in the notion of function and derivative that are seen as models for the study of variation.
We focused our attention in the role of the speech in the mathematics class when concepts and processes related to the variation notion are taught, because we considered that the speech constitutes the space where meanings are constructed, negotiated and interpreted.. The register and the transcriptions of the course are analyzed considering a particular model of qualitative research.
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