I've read that it is also a Lie group. But what does that have anything to do with special relativity or different reference frames?(adsbygoogle = window.adsbygoogle || []).push({});

The wiki definition is

"a 10-dimensional noncompact Lie group. The abelian group of translations is a normal subgroup while the Lorentz group is a subgroup, the stabilizer of a point. That is, the full Poincaré group is the affine group of the Lorentz group, i.e. the Poincaré group is a semidirect product of the translations and the Lorentz transformations:"

...blahblahblah

Can anyone please cut thebsout for me and tell me inlaymanterms the gut of what it is?

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# What is a Poincare group?

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