(Developing Rethinking Proof Sketchpad activities with UDW students - 1991)
Rethinking Proof Reviews
Mathematics Teacher, March 2000, p. 254.
The Mathematical Gazette, 89(514), March 2005, pp 124-126.
Mathematics in School, May 2007.
The Scottish Mathematical Council Journal, No.36, Spring 2007, p. 72.******
1) Download Sketchpad 5 & unlock for free after installation with provided code at Download GSP 5.
2) Download Rethinking Proof with Sketchpad as a PDF at Download Rethinking Proof.
3) Download Rethinking Proof with Sketchpad 5 sketches at Rethinking GSP 5 Sketches as a zipped file.
4) Download Sketchpad Sample Sketches and Custom Tools for GSP 5.1 at GSP 5.1 Sample Sketches and Custom Tools as a zipped file.
Does dynamic computer verification imply the end of proof? My invited Plenary Talk via Zoom, 26 October 2021, 2nd NaCoME Conference organized by the Mathematics Education Study Program of Sriwijaya University, Indonesia.
Some Reflections on the Van Hiele theory. Invited paper and video made at the Program Post-Graduate Studies in Mathematics Education at the Pontifical Catholic University of Sao Paulo, Brazil in April 2010, as well as invited plenary at the Croatian Mathematical Conference in Zagreb, Croatia in June 2010
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