Social agreement is a particular characteristic of discourse. Social agreement helps us to understand the acceptance of the interaction constructed by the participants, making the agreement a particular characteristic of the discourse, even though when the agreement is not accomplished in most cases. This research describes the roles of the different explanations given about the concept of variation during the interaction of the professor and his students in a math course of the first semester of engineering. In this research the concepts of function and derivatives functions were paramount for this study since these are considered appropriate models for the study of variation. This cased study used an ethnographic methodology and discourse analysis in order to analyze the data collected.
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