Conceptualization of function as covariation through the use of learning trajectories

Citation:

Kafetzopoulos, G. - I., & Psycharis, G. (2018). Conceptualization of function as covariation through the use of learning trajectories. In H. - G. Weigand, Clark-Wilson, A., Donevska-Todorova, A., Faggiano, E., Grønbæk, N., & Trgalova, J. (Eds.), Proceedings of the Fifth ERME Topic Conference (ETC 5) on Mathematics Education in the Digital Age (MEDA) (pp. 139-146). Copenhagen, Denmark: University of Copenhagen.
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