What exactly is all this 'matrix elements of vectors' stuff that Landau is talking about?(adsbygoogle = window.adsbygoogle || []).push({});

I don't mean to ask people unfamiliar with this section to read it for me, so hopefully for someone who's read it - what's going on and where would I find a more modern discussion of this section (I'm sure this whole chapter should become easy when written in modern notation)?

Thanks!

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# Matrix Elements of Vectors

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