Yes, I found that link also, but alas the website from Descarta2D is out of the air. It's a bit outdated software of course , but I would like try it. The major developer was Denis Monasse, a French mathematician.

I am also retired : bicycling, gardening are my daily activities. Evenings are filled with some studying in Mathematics.

Thank you for your answer. Chiel Geeraert

Hello Mr Adkins,

My name is Chiel Geeraert from the Netherlands, also retired. Just recently a bought a second hand book "Exploring Analytic Geometry with Mathematica" (Year 2000) . This book uses Descarta2D and the CD with Descarta was included. But alas, it didn't work with Mathematica 7 which I use.

Now I have read on the web that some years later there was an update on Descarta2D to make it compatible with Mathematica 7 and 8. I have looked for the updated version but I could not find it. Do you use that updated version and, if so, can I get from you?

Best regards,

Chiel Geeraert, Oostburg, the Netherlands

Thanks, Hans. I will try this. I really appreciate your help.