Possible Duplicate:
Havel-Hakimi Theorem
Hi. I'm a beginner at graph theory, and I recently came across the Havel-Hakimi Theorem which is used to determine whether a sequence of integers is graphical. I am using Chartrand and Zhang's Introduction to Graph Theory, but I feel that the proof they provide is lacking. I am wondering whether anyone is aware of a proof for this theorem or where I can find one, preferably an easier one.
Thanks.