%0 Journal Article %T Discontinuity of the Lempert function of the spectral ball %A Pascal J. Thomas %A Nguyen Van Trao %J Mathematics %D 2008 %I arXiv %X We give some further criteria for continuity or discontinuity of the Lempert funtion of the spectral ball $\Omega_n$, with respect to one or both of its arguments, in terms of cyclicity the matrices involved. %U http://arxiv.org/abs/0811.3093v4