D u +-Strom I wk + u d --Strom I wk - d(u) u(d) 3-Strom I wk 3 W-W- W+W+ W3W3 n p +-Strom + p n --Strom - n(p) p(n) 3-Strom 3 - + 0 Parallele starker-schwacher.
