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Jun 8, 2011 at 22:09 history edited Carl Brannen CC BY-SA 3.0
Corrected according to comments.
Jun 8, 2011 at 22:08 comment added Carl Brannen Yes, I'll modify my answer. (Embarrassingly, I took plasma classes in college.)
Jun 8, 2011 at 11:47 comment added Qmechanic Dear @Carl Brannen: A comment to the answer (v1): The case $\epsilon\mu<0$ is not excluded, cf. the same wikipedia article en.wikipedia.org/wiki/…
Jun 8, 2011 at 1:00 history answered Carl Brannen CC BY-SA 3.0