Recent content by migwing007

I'd like to learn QFT on my own, what's the best text for that? Srednicki's? what do people think of QFT demystifyed? thanks

Well, the converse of the first one would be: if the eigenfunctions of an operator are complete then the operator is hermitian. the second would be: if the eigenfunctions of an operator belonging to distinct eigenvalues are orthogonal then the operator is hermitian. and the third is: If the...

This is really bothering me I'm remembering from a while ago having to prove the converse of a theorem from Griffiths, but I can't remember which one of the following it is: Prove converse of: 1.) The eigenfunctions of a Hermitian operator are complete, 2.) Eigenfunctions of Hermitian...

I'm looking for a proof of the fact that orthogonal eigenfunctions of a Hermitian operator have distinct eigenvalues. I know the proof the converse: that eigenfunctions belonging to distinct eigenvalues are orthogonal. thanks a lot!