
05239903
a
2008b.00400
Maschietto, Michela
The introduction of calculus in 12th grade: The role of artefacts.
Johnsen H\o ines, Marit (ed.) et al., Proceedings of the 28th international conference of the International Group for the Psychology of Mathematics Education, PME 28, Bergen, Norway, July 1418, 2004. Bergen: Bergen University College. Part III, 273280 (2004).
2004
Bergen: Bergen University College
EN
I24
U74
C34
A64
functions
visualization
graph of a function
global/local point of view
graphics calculators
calculus
grade 12
upper secondary
student observation
empirical investigations
Italy
emis:proceedings/PME28/RR/RR138_Maschietto.pdf
Summary: The paper concerns the analysis of the role of artefacts and instruments in approaching calculus by graphicsymbolic calculator at high school level. We focus on an element of the introduction of calculus: the global/local game. We discus the hypothesis that the zoomcontrols of calculator support the production of gestures and metaphors that foster the shift from a global to a local point of view. The analysis of protocols confirms that the exploration of several functions through the zooming process was supported by gestures and language. They appeared during the zooming process and in pupils' answers to the tests when the calculator was no more available and when the task concerned mathematical objects.