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Why is Casimir operator T[itex]^{a}[/itex]T[itex]^{a}[/itex] be an invariant of the coresponding Lie algebra? I know that Casimir operator commutes with all the group generators T[itex]^{a}[/itex].

Thank you very much for your kind helping.

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# Why is Casimir operator to be an invariant of coresponding Lie Algebra?

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