Media type: E-Article Title: Proof and proving in the classroom: Dynamic Geometry Systems as tools of semiotic mediation Contributor: Mariotti, Maria Alessandra imprint: Informa UK Limited, 2012 Published in: Research in Mathematics Education Language: English DOI: 10.1080/14794802.2012.694282 ISSN: 1754-0178; 1479-4802 Keywords: General Mathematics ; Education Origination: Footnote: