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Please excuse me about my ignorance.

I would like to know how SO(2,1) Lie algebra, is derived from operators and commutators.

I have some notes, that the Lie algebra of SO(2,1) is derived from:

[D,H]=-iH

[K,D]=-iK

[H,K]=2iD

where D, H, and K are the "generators".

I have no clue what does the word "generators" mean, nor how commutators derive an algebra.

Please let me know.

Thank you,

Askalot.

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# SO(2,1) invariance algebra

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