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## Main Question or Discussion Point

Is the relation [itex]v_{\varphi }v_{g}=v^{2}=\frac{1}{\mu \varepsilon }[/itex] always true in a plasma ?

Where [itex]v_{\varphi }[/itex], [itex]v_{g}[/itex] are respectively the phase and group velocity of the electromagnetic wave that is propagating in the plasma.

Where [itex]v_{\varphi }[/itex], [itex]v_{g}[/itex] are respectively the phase and group velocity of the electromagnetic wave that is propagating in the plasma.