changed: - My TeX does not complain (and displays it correctly) \begin{axiom} solve([x^2 + y^2 - 2*(ax*x + ay*y) = l1, x^2 + y^2 - 2*(cx*x + cy*y) = l2],[x,y]) \end{axiom} Martin
My TeX? does not complain (and displays it correctly)
axiomsolve([x^2 + y^2 - 2*(ax*x + ay*y) = l1, x^2 + y^2 - 2*(cx*x + cy*y) = l2],[x,y])
Martin