I was reading Lie Algebras in Physics by Georgi.......................second edition...(adsbygoogle = window.adsbygoogle || []).push({});

Theorem 1.2: He proves that every finite group is completely reducible.

He takes

[tex]PD(g)P=D(g)P[/tex]

..takes adjoint...and gets..

[tex]P{D(g)}{\dagger} P=P {D(g)}{\dagger} [/tex]

So..does this mean that the projection operator P is hermitian?

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# Is a projection operator hermitian?

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