Is there a guide to using the density matrix formalism in quantum mechanics?

[peterjaybee]

Hello, I am looking for a guide to quantum mechanics and the density matrix formalism which uses the Einstein summation convention. Does such a guide exist?

 

[peterjaybee]

I ask because bra's and ket's seem to behave in a similar manner to co-varient and contra-varient vectors. I guess this is not a coincidence.

 

[A. Neumaier]

I ask because bra's and ket's seem to behave in a similar manner to co-varient and contra-varient vectors. I guess this is not a coincidence.

No. See the section ''What are bras and kets'' in Chapter A1 of my theoretical physics FAQ at
http://arnold-neumaier.at/physfaq/physics-faq.html#A1