Field Notes / Σ /sym/b26508
id=1 · host=uk.mattivster.me · 2026-10-19 03:19Z
\frac{1}{3} \sum_{i=1}^{n} i^{2}
∫₀^∞ e^(-β²) dβ = √π / 2
66K
∑_{k=1}^{n} k = n(n+1)/2
\binom{n}{k} = \frac{n!}{k!(n-k)!}
87K
\lim_{φ\to 0} \frac{\sin φ}{φ} = 1
\oint_C \vec{F}\cdot d\vec{r} = 0
61K
∇²x = 0
Fe₂O₃ + 3CO → 2Fe + 3CO₂
∇ × E = −∂B/∂t