Hi there! I try to understand and to use graphical method in the theory of angular momentum. It is not very difficult to master is fundamentals excepting a few things. The most fundamental is the following. In literature there is used the fact that Kat and Bra vectors with momentum j,m can be mutually permutated using <jm| = (-1)j-m |j, -m>. It is clear for integer j. But how to understand this fact, for example, in the case j = 1/2 ? I would be glad if somebody could give me advice. I'm absolutely novice at forums where scientific questions are discussed. So, first of all, I would be glad to see a few words about where else I can discuss such questions. What cites / forums are the most popular for these purposes? With Best Regards, Antony Gorkh.