I can't get affine work : Is there a way to declare quaternions as i j k and not v1 v2 and v1.v2 which is really difficult to read in matrices, but atensor works fine kind regards -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.math.utexas.edu/pipermail/maxima/attachments/20081020/2518594b/attachment.htm