we all know the lorentz group is of four disconnected components(adsbygoogle = window.adsbygoogle || []).push({});

about the component connected to the unit element,

is it coverable with single-parameter subgroups?

put it in another way

are all the elements in this component of the form exp(A)?

i am studying relativistic quantum mechanics, and i find that most textbooks take this to be guaranteed.

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# Can the lorentz group be covered by single-parameter subgroups?

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