Seam strict locality
v461_seam_strict_locality.py · frontier
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SEAM.S3.LOCALITY.01: the Kapustin-Fidkowski/Thouless strict-locality OBSTRUCTION made explicit -- sharpening v460's verdict from a cited statement to an exhibited topological obstruction. [E] CHERN INTEGER: the FHS Chern of v367's p+ip collar = +1 (chiral M=1), 0 (trivial M=3), -1 (opposite mass). [E] WILSON-LOOP / WANNIER-CENTRE WINDING = CHERN: the hybrid Wannier centre theta(ky) winds by |C|=1 (chiral) and 0 (trivial) over the BZ -- exp-localised Wannier exist IFF winding=0 (Brouder et al.), so the chiral collar has NO exp-localised Wannier basis. [E] OBSTRUCTION INTEGERS TIED: winding=|C|=1!=0 and c_-=16/2=8=g_car+N_fam=rank E8!=0. [E] NEG CONTROL: BOTH phases gapped, yet only the trivial (winding 0) admits exp-localised Wannier and a strict finite-range commuting projector -- it is the CHIRALITY, not the gap. [C]/[O] a strictly finite-range commuting projector would force winding 0, C=0; since C=1!=0 none exists, so v424 sub-step (i)'s realisation is PROVABLY the quasi-local NPW26 LTO net; SEAM.EQUIV.01 stays [O]. Python-only (numpy).
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