L.S. I am looking for detailed information on the subject of cubic equations. Problem is that I cannot find anything but the most basic properties of such equations. For example, if given an arbitrary cubic equation with roots x(i),where to find the equation like with roots y(i) = x(i) - x(j)? Another one: Omar Khayyam found a construction /graphical solution for the cubic with only one real root. I suppose that since his work also the graphical solution for cubics with three real roots has been found; where is that published, please help me to that! For a good understanding: I have the answers to both problems but had to calculate them myself. It took a long time and I expect to have done a monks job. Thanks for your help.