E8 kleinian seam
v232_e8_kleinian_seam.py · horizon
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The seam as the E8 Kleinian singularity -- a canonical algebraic-geometric MODEL for the open seam-realisation premise QGEO.REALIZE.01 (the du Val side of the McKay correspondence, v219). The McKay graph of 2I is affine E8; dropping the unique trivial-rep node (single Kac mark=1) leaves the finite E8 Dynkin on 8 nodes = the dual intersection graph of the 8 exceptional P^1's of the minimal resolution of C^2/2I (trivalent node, arms 1,2,4). EIGHT exceptional P^1's = rank E8 = g_car+N_fam = #nontrivial 2I irreps -- a fourth reading of the '8'. The negated intersection form is the E8 Cartan (even, det 1, positive definite; each P^1 a (-2)-curve). One degree-1 irrep => 2I perfect => H1(S^3/2I)=0: the link is the Poincare homology 3-sphere, pi1=2I order 120=|R+(E8)|. Seam reading: the raw RP seam (P^1 with marks) is canonically a du Val exceptional curve -- a model for QGEO.REALIZE.01, not a P2 proof (presupposes E8).
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