Proceedings CIEAEM 58 –SRNI, Czech Republic, July 9-15, 2006 “Quaderni di Ricerca in Didattica (Matematica)”, Supplemento n. 3, 2009.

G.R.I.M. (Department of Mathematics, University of Palermo, Italy)

CIEAEM 58 –SRNI, Czech Republic, July 9-15, 2006

Proceedings CIEAEM 58 –SRNI, Czech Republic, July 9-15, 2006 “Quaderni di Ricerca in Didattica (Matematica)”, Supplemento n. 3, 2009.

G.R.I.M. (Department of Mathematics, University of Palermo, Italy)

CIEAEM 58 –SRNI, Czech Republic, July 9-15, 2006

2

Proceedings CIEAEM 58 –SRNI, Czech Republic, July 9-15, 2006 “Quaderni di Ricerca in Didattica (Matematica)”, Supplemento n. 3, 2009.

G.R.I.M. (Department of Mathematics, University of Palermo, Italy)

3

CIEAEM 58 –SRNI, Czech Republic, July 9-15, 2006

Proceedings CIEAEM 58 –SRNI, Czech Republic, July 9-15, 2006 “Quaderni di Ricerca in Didattica (Matematica)”, Supplemento n. 3, 2009.

G.R.I.M. (Department of Mathematics, University of Palermo, Italy)

CIEAEM 58 –SRNI, Czech Republic, July 9-15, 2006

4