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Why those topics? What's required to sufficiently "know" those topics? What qualifies you to set these standards & tell someone they aren't a physicist? If I research quantum fields for decades but forget everything I know about Maxwell's Eqs, why am I no longer a physicist?
i think we're getting somewhat off track .. the point is that if you wanted to use maxwell's equations you could look them up and use standard methods within around a day or so .. i would definitely say that constitutes an understanding
in the same way that no dev knows every language but they could certainly learn it faster than any of us ..
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