A case study is presented with students entering university, in order to determine semiotic means of objectification and gestures that emerge when they analyze a curve to interpret a variation phenomenon. Three group tasks are designed and applied, with the purpose of identifying cultural knowledge that promote and strengthen mathematical ideas. The productions are analyzed through three proposed categories with which some notions and gestural relations to which the students resort in their arguments are concluded.
Key words: Gesture, slope, semiotic means of objectification.
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