v 7.7

n^{2} = ε = 1 + \frac{N e^{2}}{ε_{0} m_{e}} \frac{1}{ω_{0}^{2} - ω^{2}}

${n^2= \varepsilon =1+ \frac{Ne^2}{\varepsilon_0 m_e} \frac {1}{\omega_0^2 - \omega^2}}$

Error