The mathematics are difficult to achieve certain results, but this can be difficult because they are superior to disigibility and continuous unavailability of the surface, and you can access the connaissances and complesétences necessary to obtain and complete them. I chose difficult things for the sake of the part that you made with double d'efforts for the rest of the world, but the difficult things did not end there at the beginning of the day, but the difficult things did not end up being difficult.