Dear KDE/KAlgebra<br><br>Thank you for your maths software package.<br><br>It appears to me that the 3-D graphs have a left-handed system of axes. The convention throughout maths and science is to use right handed axes. The direction of your z-axis should be reversed.<br>
<br>Yours,<br><br>Dr John Coffey<br>Knutsford, England<br>