Sheet conjugation bridge
v97_sheet_conjugation_bridge.py · registry
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Sheet-conjugation bridge (P1 → one [P]): the cusp negation (0 fixed, 1/3↔2/3 on the Q₊ eigenspaces) has a UNIQUE anchor-compatible integer realisation T_A=[[0,1,0],[1,0,0],[2,−2,1]] (det −1; the two alternative pairings rejected); a = e₂+e₃ — the anchor IS the conjugation-symmetric vector; T_A = −1 on R³/span{1,a} exactly like σ₁₂ (one deck action); ⟨T_A,Σ⟩ = the v69 D₄; sheet-index lemma: generation-μ₄ vs homology-μ₄ intertwiner dets always EVEN, min |det| = 2 = |Z₂|; remaining [P]: Q₊ grading = A₃ discriminant grading
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