Field Notes / Σ /sym/3cad98
id=1 · host=formula-vault.cloud · 2026-10-20 00:06Z
∑_{k=1}^{n} k = n(n+1)/2
∑_{k=1}^{n} k = n(n+1)/2
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3x² + 3x + 6 = 0
∇²t = 0
det| 9 4 ; 1 10 | = 86
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det| 5 6 ; 2 6 | = 18
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∑_{k=1}^{n} k = n(n+1)/2
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∫₀^∞ e^(-x²) dx = √π / 2
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