Dirk Kreimer at MSRI - From unique factoriztaion of graphs to gauge symmmetries

<BODY> MSRI Streaming Video Series <BR> Dirk Kreimer - From unique factoriztaion of graphs to gauge symmmetries <BR> <center> A PDF version of the lecture notes is available <A HREF="http://www.msri.org/publications/ln/msri/2002/ssymmetry/kreimer/1/meta/aux/kreimer.pdf">here</A>. </center> </BODY>