This GeoGebra Book presents the work developed for the GeoGebra 2015 Global Gathering in Linz of the 15 July 17, 2015.
[b]Celina A. A. P. Abar [/b]
[i]Postgraduate Program Studies in Mathematics Education
GeoGebra Institute of São Paulo
Pontifical Catholic University - São Paulo- Brazil[/i]
