| $\sqrt2-1 \approx 0.41421$ | [DV1983](#DV1983) | Drinfeld--Vlăduţ (Ihara) bound: $A(q)\le \sqrt q-1$ for every prime power $q$. [DM2013-dv-bound] |exact pinned row| $\sqrt2-1 \approx 0.41421$ | [DV1983](#DV1983) | Drinfeld--Vlăduţ (Ihara) bound: $A(q)\le \sqrt q-1$ for every prime power $q$. <a href="#DM2013-dv-bound">[DM2013-dv-bound]</a> |tracked since 2026-07-24 — no movement seen yet
Lower bound, last-listed row
| $0.316999\ldots$ | [DM2013](#DM2013) | Lower bound from [DM2013](#DM2013) (also listed in [Bee2022](#Bee2022)). [DM2013-thm1.1] [Bee2022-lb-best] |exact pinned row| $0.316999\ldots$ | [DM2013](#DM2013) | Lower bound from [DM2013](#DM2013) (also listed in [Bee2022](#Bee2022)). <a href="#DM2013-thm1.1">[DM2013-thm1.1]</a> <a href="#Bee2022-lb-best">[Bee2022-lb-best]</a> |tracked since 2026-07-24 — no movement seen yet
Cite this rowBounds Ledger — Ihara constant over $\mathbf{F}_2$ (33a)
upper bound: $\sqrt2-1 \approx 0.41421$ (tracked since 2026-07-24 — no movement seen yet)
lower bound: $0.316999\ldots$ (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/33a.html