Disjoint Unions

I had countless revelations about math and LaTeX over the last week. I don't know why this happened but i made a major step forward. Most of them are little but they add up and it shows. One of the things that I fudged together years ago was an ugly construction for disjoint unions, something along the lines suggested in a4symbol.pdf. The correct solution however is to \usepackage{MnSymbol} and use \cupdot/\bigcupdot!