I just updated my website with a new interface. I'm desperately seeking some people to test it out. Since I'm not an established member so I cannot post the link, but you'll find it by putting "www" before and "com" after my username. Let me know if you like it! Tell me what you don't like!
PS: use Firefox, Chrome, Safari or IE 9+ to take full advantage of the features
Link added by administrator.
Welcome to the forum.
In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.