v 7.5

χ = \frac{N e^{2}}{ε_{0} m_{e}} \frac{1}{[(ω_{0}^{2} - ω^{2}) + i ω γ]}

${\chi = \frac{Ne^2}{\varepsilon_0 m_e} \frac{1}{[(\omega_0^2-\omega^2 )+i\omega \gamma]}}$

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