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A Host–Kra $$\mathbb {F}_2^\omega $$-system of order 5 that is not Abramov of order 5, and non-measurability of the inverse theorem for the $$U^6(\mathbb {F}_2^n)$$ norm

Crossref DOI link: https://doi.org/10.1007/s00208-026-03344-5

Published Online: 2026-02-07

Published Print: 2026-01

Update policy: https://doi.org/10.1007/springer_crossmark_policy

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