Flataway spectral hessian
v293_flataway_spectral_hessian.py · frontier
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FLATAWAY.SPEC.01 — the Spectral-Rigidity route upgraded from one direction (v291) to the FULL smooth-Z4 space. [E] splitting mechanism: the degenerate flat Steklov level |n| is split by mode 4k at |n|=2k by ±ε/2 (modes 4,8,12 split levels 2,4,6); [E] S=Σ(Δλ)² ~ 0.50ε² (quadratic); [E] the Hessian over modes {4,8,12} has eigenvalues ~{0.497,0.500,0.503}>0, so the flat seam is a STRICT isolated minimum over the whole Z4 space (answers the 'only one direction' objection); [E] clock-filter contrast: a non-Z4 mode (cos2θ) breaks the commutator outright. [O] consequence: pinning the seam's forced Steklov spectrum excludes every smooth Z4 deformation ⇒ Flat-Away — the same external fact as v292, reached independently.
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