Figure 23

Figure 23: DE10 ≡ D++8 regularly embedded in E10. Labels 2,⋅⋅⋅ ,10 represent the simple roots α ,⋅⋅⋅ ,α 2 10 of E 10 and the unlabeled node corresponds to the positive root ¯ β = 2α1 + 3α2 + 4α3 + 3α4 + 2 α5 + α6 + 2α10.