Canonical map
v140_canonical_map.py · registry
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THE CANONICAL MAP EXISTS AND IS RIGID (the GATE.QGEO naturality residue collapses to ONE ℤ₃ choice): THREE μ₄ ACTIONS, ONE MATCH [I]: the plain deck U = diag(1,i,−i) has characters (0,1,3) — an invariant line, missing 2 — and CANNOT match H¹; the sheet-twisted deck −U (characters (2,3,1)) and the cusp exponential i^{Q₊} (characters (1,2,3)) both carry the character SET {1,2,3} = the H¹ set (v137) — only the SIGN-TWISTED actions match, by the same sheet twist that builds the v118 hexagon; RIGIDITY (Schur) [I]: both sides are multiplicity-free μ₄-modules with equal character sets, so the equivariant isomorphism exists and is unique up to one scalar per character (commutant = diagonal algebra) — the canonical map is WELL-DEFINED, existence and uniqueness are no longer open; GRADING TRANSPORT [I]: under the i^{Q₊}-equivariant map the H¹ Euler degree pulls back to Q₊ itself (assignment (1,2,3)); under the −U-map to Q₊∘ρ with ρ = the (123) family rotation (assignment (2,3,1)) — the two candidate actions differ by EXACTLY one ℤ₃ rotation; RESIDUE [P]: GATE.QGEO collapses from 'prove naturality' to ONE discrete choice — which sign-twisted action is the geometric boundary deck on generation space (−U monodromy sheet twist vs i^{Q₊} cusp exponential) (the choice since derived, v141)
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