x_o := MaximalOrder(X^3 -299*X -2403); x_a := 3*x_o+Coerce(x_o,[-5,-5,7])*x_o; Type(x_a);

x_o := EquationOrder(X^2+5); x_b := Ideal(x_o,Matrix(Z,2,2,[1,1,0,2])); Type(x_b);