Σ index Eq pack 19 Rxn set 20 Rxn set 26 Σ#24 Σ#12 Ledger /21 Eq pack 13 Ledger /3 Eq pack 1 Batch 16 Σ#18 Σ#6 Ledger /15 Batch 4

Field Notes / Σ /sym/3cad98

id=1 · host=formula-vault.cloud · 2026-10-20 00:10Z

∑_{k=1}^{n} k = n(n+1)/2

∑_{k=1}^{n} k = n(n+1)/2

168K

det| 7 4 ; 4 8 | = 40

446K

3x² + 3x + 6 = 0

8x² + 2x + 7 = 0

144K

N₂ + 3H₂ ⇌ 2NH₃

371K

∇²t = 0

det| 5 2 ; 3 6 | = 24

259K

11t² + 9t + 7 = 0

86K

7z² + 2z + 0 = 0

Fe₂O₃ + 3CO → 2Fe + 3CO₂

224K

det| 2 3 ; 5 3 | = -9

234K

ΔS ≥ 0

218K

\binom{n}{k} = \frac{n!}{k!(n-k)!}

354K

H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O

70K