SCHEDE DI VERIFICA:
https://www.dropbox.com/s/r7hxe3j5nrnswzb/concetti%20topologici.doc?dl=0
https://www.risorsedidattiche.net/doc/elementare/matematica/_concetti_logici.pdf
http://www.maestralucia.it/wp-content/uploads/2013/08/Verifica-concetti-topologici.pdf