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?

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Is a projection operator hermitian?

**Physics Forums | Science Articles, Homework Help, Discussion**