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Brennan's conjecture exponent

67a
Upper bound, last-listed row
| $4$ | [[HC2015](#HC2015)] | Conjectured endpoint. [HC2015-conjecture-range] |
exact pinned row| $4$ | [[HC2015](#HC2015)] | Conjectured endpoint. <a href="#HC2015-conjecture-range">[HC2015-conjecture-range]</a> |
tracked since 2026-07-24 — no movement seen yet
Lower bound, last-listed row
| $3.422$ | [[HC2015](#HC2015)] | Historical summary attributes this threshold to Bertilsson's dissertation. [HC2015-best-known-3-422] |
exact pinned row| $3.422$ | [[HC2015](#HC2015)] | Historical summary attributes this threshold to Bertilsson's dissertation. <a href="#HC2015-best-known-3-422">[HC2015-best-known-3-422]</a> |
tracked since 2026-07-24 — no movement seen yet
the mirrored file · upstream source · looks wrong?
Cite this rowBounds Ledger — Brennan's conjecture exponent (67a) upper bound: $4$ (tracked since 2026-07-24 — no movement seen yet) lower bound: $3.422$ (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/67a.html