Maxima Function
evolution2d ([F, G], [u, v], [u0, y0], n, ..., options, ...);
Shows, in a two-dimensional plot, the first n+1 points in the sequence of points defined by the two-dimensional discrete dynamical system with recurrence relations
u(n+1) = F(u(n), v(n)) v(n+1) = G(u(n), v(n))
With initial values u0 and v0. F and G must be two expressions that depend only on two variables, u and v, which must be named explicitely in a list.