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… changes when their semiotic representations undergo treatment and conversion. La matematica e la sua didattica, 21, n. 1, 87-92. Actas del: Joint Meeting of UMI-SIMAI/SMAI-SMF: Mathematics and its Applications. Panel en Didáctica de la Matemática. … changes when their semiotic representations undergo treatment and conversion. La matematica e la sua didattica, 21, n. 1, 87-92. Actas del: Joint Meeting of UMI-SIMAI/SMAI-SMF: Mathematics and its Applications. Panel en Didáctica de la Matemática. …