I have to write a graduation work. My theme is '' Recursive formula ''. It is a very difficult part of mathematics. I am already at the end I wrote 20 pages and it goes very well. But I'm not a lover of this mathematics. My only problem is to learn it. I still have a month ahead. Has anyone been in a touch with this? Have anyone a good method to learn it? One part of the work is really interesting '' Towers of Hanoi ''.