Field Notes / Σ /sym/3cad98
id=1 · host=formula-vault.cloud · 2026-10-20 23:10Z
∑_{k=1}^{n} k = n(n+1)/2
∑_{k=1}^{n} k = n(n+1)/2
168K
det| 4 1 ; 4 5 | = 16
det| 9 4 ; 1 10 | = 86
144K
\frac{8}{7} \sum_{i=1}^{n} i^{2}
371K
∫₀^∞ e^(-x²) dx = √π / 2
Fe₂O₃ + 3CO → 2Fe + 3CO₂
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\lim_{α\to 0} \frac{\sin α}{α} = 1
86K
\binom{n}{k} = \frac{n!}{k!(n-k)!}
\frac{9}{4} \sum_{i=1}^{n} i^{2}
5β² + 5β + 3 = 0