\frac{d}{d t} (\frac{\partial L}{\partial q ˙} δ q) = 0

⟨ x_{f} ∣ e^{- i H t /ℏ} ∣ x_{i} ⟩ = \int D [x (t)] e^{i S [x] /ℏ}

(i γ^{μ} \partial_{μ} - m) ψ = 0

G_{μν} + Λ g_{μν} = \frac{8 π G}{c ^{4}} T_{μν}

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Gauss and the regular 17-gon: one morning, a two-thousand-year-old problem

2026-05-29 #timeobserver137 #math companion #g17

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