# What kind of question is it?

by roshan2004
Tags: kind
 P: 139 In my terminal exam I was asked to prove it that the parity operation commutes with Hermitian operator? I wonder how can we show that? coz we can only show that the parity operator is hermitian? We haven't got the value of hermitian operator at all?
 P: 278 On wave functions the parity operator acts something like $$P\psi(x)=\eta\psi(-x)$$ where \eta is a phase factor independent of x. Now it should be easy to prove all the commutation relations you need.
 P: 139 Pls Can you show it to me how?
P: 278

## What kind of question is it?

I can try, but first you have to tell me which is the operator you want to calculate the commutator with parity.
 P: 139 Hermitian operator
P: 278
 Quote by roshan2004 Hermitian operator
It's not enough. For example, P does not commute with the coordinates x or the momenta p (these anticommute with parity), but it commutes with orbital agular momentum or spin...
 P: 139 So, wasn't the question a wrong one?
 P: 133 If it really implied that the parity operator commutes with all Hermitian operators, then yes, it was wrong.

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