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The first rough patch I've come across so far deals with the introduction of a mathematical object Maloney calls lambda mu nu prime, presumably a 4x4 matrix. I don't know what this is or how it fits with the rest of the discussion. In addition, it includes an upper and lower index which he doesn't explain how to read. The lower index is primed and the upper is not. What does that mean? What kind of matrix is this, why doesn't he write it out? Is it related to the flat space-time Minkowski zeta matrix?

In any case, please fast forward to 36:40:

Another video I came across this Lambda term in with similar confusion is Here at 10:50:

So, perhaps here the idea is that any mathematical physicists worth his slide rule just of course can look at this lambda object and know exactly what it is, which is why neither of these guys takes a minute to explain what they are. Not me though, and any help would be appreciated.