Coxeter prime2 lemma
v409_coxeter_prime2_lemma.py · frontier
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RES.COXETER.SYMMETRY.01 closed as a STRUCTURAL LEMMA: prime-2 is NECESSARY but NOT autonomous -- no prime-2-only attractor exists (resolves the v394/COXETER.ATOMS.01 open question's falsifiable corollary). [E] SHEET INVOLUTION: sigma=diag(1,-1,-1), sigma^2=I, spectrum {+1,-1} (parity). [E] SHEET PROJECTOR P=(I+sigma)/2=diag(1,0,0), P^2=P, spectrum {0,1} (projection). [E] NO CONTRACTION RATE: none of {-1,0,1} lies in (0,1), whereas the genuine rates 2/3 and (1/3)^6 do -- prime-2 alone gives parity/projection, never a nonzero rate. [E] FACTOR NOT RATE: 2/3=|Z2|/N_fam needs prime-3, (phi+2)/4=(phi+2)/|mu4| with |mu4|=2^2 needs the golden phi (prime-5). [E] 30=g_car(2 N_fam), carrier static, 2*3 dynamic. [C] prime-2 is the universal dynamical parity factor, necessary in every sheet-paired transport but not an autonomous attractor; dynamics begins after coupling to family-3 or carrier-5 (mu4=2^2 the Galois bridge). No new number.
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