About use of this notebook
Throughout this notebook, use the triangular bullets to show or hide pieces of information arranged in 'cells'.

Icons on the right of each cell are linked to other html files or files for download. Click the icons to open these files.

Most pages in this notebook contain files with Java applets (created with the software below) which have to be opened with Java enabled browsers. Update your Java machine, if necessary at http://www.java.com .

Geogebra by Markus Hohenwarter: http://www.geogebra.org/cms/

Cinderella 2 by J. Richter-Gebert and U. Kortenkamp: http://cinderella.de/tiki-index.php

Cabri Java from http://www.cabri.net/cabrijava/  

NetLogo from http://ccl.northwestern.edu/netlogo/