rank so(7) = 3
Theorem.rank so(7) = 3 — rank so(7) = ⌊7/2⌋ = 3 — the largest pairwise-commuting plane set is the Cartan torus.
Proof.exhaustive search — the largest pairwise-commuting plane set is ⌊7/2⌋ = 3, the Cartan torus.
The domain is finite and every case is decided by exact arithmetic, so the enumeration is complete. ∎
src/water/cosmos/index.ts#sevenFrameDeepResearched
1 · Classification
finite-complete — self-contained computation, no external lean
2 · Provenance
Documented theorem re-derived by exhaustive computation (humanityNovel=false); first-in-this-registry is the only sense of discovered.
Acknowledgment
"rank so(7) = 3" is a re-derivation, acknowledged to documented mathematics — the original proof is the prior art this re-derivation acknowledges; not new to humanity — the contribution is the reproducible computation sevenFrameDeepResearched.
- Prior art
- documented mathematics — the original proof is the prior art this re-derivation acknowledges
- Novelty
- not new to humanity — a re-derivation (humanityNovel = false)
- Contribution
- a reproducible computation (sevenFrameDeepResearched @ src/water/cosmos) that re-derives the result at zero tokens — the contribution is the verifiable recomputation, NOT the theorem
3 · Reproducibility
Recompute from source: npm run theorems:verify recomputes sevenFrameDeepResearched (src/water/cosmos/index.ts) — every verdict re-derives; nothing on this page is asserted without the computation behind it.