Pillowcase keystone
v325_pillowcase_keystone.py · frontier
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The seam keystone as ONE citable theorem: the raw seam state is the flat tau=i pillowcase state, with EXACTLY ONE open lemma. IF (raw RP-collar seam state = flat tau=i pillowcase / rotation-invariant state) THEN 4 square marks + mu4 deck + omega o rho=omega + holomorphic c=8 => (E8)_1, with the carrier recovery gap as input. Pieces (all exact): n=2chi(S^2)=4 (v216); cross-ratio 2 => j=1728 (v214/v267); flat orbifold S^2(2,2,2,2), chi_orb=0 (Troyanov); DtN sub-principal at m=0 mod 4 (v201/v280); det Cartan(E8)=1 vs D8=4 (v83/v143/v308); gap 6 ln(3/2)>0 (v76/v302). The ONE open lemma -- the raw collar state IS the flat tau=i pillowcase / rotation-invariant state -- is SHARED by both bedrock IDs (QGEO.SYM.01, SEAM.EQUIV.01; v323), machine-pinned in Lean (FORM.SEAMEQUIV.01 + FORM.QGEO.BW.01). An assembly/reduction certificate (like v176/v261), not a closure.
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