El s?b, 22-12-2012 a las 11:03 +0100, Adam escribi?: > e3:2*b^2 ? 3*c^2 -1; I get an error when I copy & paste this expression in Maxima. Take a look at the minus signs, they are not the same character in the second and third terms. This works: e3:2*b^2 - 3*c^2 -1; -- Mario