Electronic interactive Worksheets
A visual and dynamic way of learning Geometry

Hans-Jürgen Elschenbroich, Germany

Plenary Talk at CabriWorld 2001, Montreal

"A generation has grown up that may be far more visual than verbal ...
The state of mind of young mathematicians is not what it was fifty or hundred years ago ..."

Phillip J. Davis   (1993)

"Thanks to computer graphics, much of the mathematican's search for pattern is now guided by what one can really see with the eye, whereas nineteen century mathematical giants like Gauss and Poincare had to depend more on seeing things with their mind's eye."

Lynn A. Steen  (in: Davis 1993)