Cite this rowBounds Ledger — Marton's conjecture (Polynomial Freiman-Ruzsa) constant (18a)
upper bound: $9$ (tracked since 2026-07-24 — no movement seen yet)
lower bound: $1$ (tracked since 2026-07-24 — no movement seen yet)
Mirrored from teorth/optimizationproblems@2c1968c. These are the last-listed rows of that constant's bounds table — a listing position, not a statement that this bound is the strongest or most recent. A snapshot at that sha, not a live read.
https://u00dxk2.github.io/bounds-ledger/c/18a.html