Abstract
An irreducible II1-subfactor \({A\subset B}\) is exactly 1-supertransitive if \({B\ominus A}\) is reducible as an A − A bimodule. We classify exactly 1-supertransitive subfactors with index at most \({6\frac{1}{5}}\), leaving aside the composite subfactors at index exactly 6 where there are severe difficulties. Previously, such subfactors were only known up to index \({3+\sqrt{5} \approx 5.23}\). Our work is a significant extension, and also shows that index 6 is not an insurmountable barrier.
There are exactly three such subfactors with index in \({(3+\sqrt{5}, 6 \frac{1}{5}]}\), all with index \({3+2\sqrt{2}}\). One of these comes from SO(3) q at a root of unity, while the other two appear to be closely related, and are ‘braided up to a sign’.
This is the published version of arXiv:1310.8566.
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Communicated by Y. Kawahigashi
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Liu, Z., Morrison, S. & Penneys, D. 1-Supertransitive Subfactors with Index at Most \({6\frac{1}{5}}\) . Commun. Math. Phys. 334, 889–922 (2015). https://doi.org/10.1007/s00220-014-2160-4
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DOI: https://doi.org/10.1007/s00220-014-2160-4