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[Mentors' note: This thead was forked from another thread - hence the reference to "these replies" in the first post]

I am wondering why all these replies only discuss Lorentz transformations in 1+1 spacetime dimensions. That is the easy bit. The problems in understanding arise in 2+1 dimensions, and even more so in 3+1 dimensions. I understand Lorentz transformations in 1+1 dimensions, where we are talking about 2 independent observers. I struggle in 2+1 dimensions, where we have three independent observers. In 3+1 dimensions, with four independent observers, I cannot make any sense of the Lorentz group. And I am a group theorist.

I am wondering why all these replies only discuss Lorentz transformations in 1+1 spacetime dimensions. That is the easy bit. The problems in understanding arise in 2+1 dimensions, and even more so in 3+1 dimensions. I understand Lorentz transformations in 1+1 dimensions, where we are talking about 2 independent observers. I struggle in 2+1 dimensions, where we have three independent observers. In 3+1 dimensions, with four independent observers, I cannot make any sense of the Lorentz group. And I am a group theorist.

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