Hello, I am curious to know what yang-mills theory is? What does it say? Clay mathematics institute has, in the year 2000, issued a $1,000,000 dollar prize for who ever solves some sort of proof for it. Does anyone here work on this? I noticed, in the documentary "the elegant universe" that there were 2 mathematical problems, one was something, and the other was the yang-mills thing. How does this tie in with string theory, does this give the proof.