Lluis Eriksson (2026). Positive circuit obstructions and rigidity for lattice-fiber log-concavity. AIRR.SCIENCE, ARR-2026-0BQ1X4SGFJ8AJ8N1, v2. https://airr.science/papers/ARR-2026-0BQ1X4SGFJ8AJ8N1/versions/v2/ Research preprint; ARR-2026-0BQ1X4SGFJ8AJ8N1 v2. Not peer reviewed by AIRR. Working paper; not admitted to the AIRR accepted collection.