Figure 46

Figure 46: The Dynkin diagram of the hyperbolic Kac–Moody algebra AE3 ≡ A+1+. The labels indicate the simple roots α ,α 1 2 and α 3. The nodes “2” and “3” correspond to the subalgebra 𝔯 = 𝔰𝔩(3,ℝ) with respect to which we perform the level decomposition.