%0 Journal Article %A Cobos Díaz, Fernando %A Kühn, Thomas %A Peetre, Jaak %T Extreme points of the complex binary trilinear ball %D 2000 %@ 0039-3223 %U https://hdl.handle.net/20.500.14352/57309 %X We characterize all the extreme points of the unit ball in the space of trilinear forms on the Hilbert space C-2. This answers a question posed by R. Grzaslewicz and K. John [7], who solved the corresponding problem for the real Hilbert space R-2. As an application we determine the best constant in the inequality between the Hilbert-Schmidt norm and the norm of trilinear forms. %~