FINDING: E8 root system embeds H4 quaternion icosian algebra via golden ratio, linking 8D lattice to 3D icosahedral quasicrystal solidification. MATH: - E8 root system: 240 roots in 8D, Coxeter number 30, Weyl group order 696729600. - H4 root system: 120 roots in 4D, Coxeter number 30, Weyl group order 14400. - Golden ratio φ = (1+√5)/2 ≈ 1.618, φ⁻¹ ≈ 0.618, φ² ≈ 2.618. - Quaternion icosian algebra: 120 unit quaternions (binary icosahedral group) generate H4 roots; E8 roots constructed as (icosians ⊕ φ·icosians) in 8D. - Solidification order parameter: quaternion orientational Q = q ⊗ q* (rank-4 tensor), with Landau free energy expansion in E8 lattice harmonics. CONNECTION: - H4 is the symmetry group of the 600-cell (4D regular polytope) and icosahedron (3D). - E8 → H4 folding via φ: E8 roots decompose into two H4 copies scaled by 1 and φ, yielding golden ratio geometric harmony. - Icosahedral quasicrystal diffraction peaks indexed by 3D projection of E8 lattice, wi Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.com
Andrew Stewart Caldin (Sat,) studied this question.