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Gauss's Law
ΦE=Qε0\Phi_E = \frac{Q}{\varepsilon_0}
Schrödinger Equation (Time-Dependent)
iℏddt∣Ψ⟩=H^∣Ψ⟩{\displaystyle i\hbar {\frac {d}{dt}}|\Psi \rangle ={\hat {H}}|\Psi \rangle }
Fourier Transform
cn=1P∫−P/2P/2f(x) e−i2πnPx dx.{\displaystyle c_{n}={\tfrac {1}{P}}\int _{-P/2}^{P/2}f(x)\,e^{-i2\pi {\frac {n}{P}}x}\,dx.}