The discussion centers on the search for a guide to quantum mechanics specifically focusing on the density matrix formalism and the Einstein summation convention. A user inquires about resources that explain the relationship between bras and kets and their similarity to covariant and contravariant vectors. A definitive response points to Chapter A1 of the theoretical physics FAQ by Arnold Neumaier, which provides relevant insights on the topic.
PREREQUISITESStudents and researchers in quantum mechanics, theoretical physicists, and anyone interested in the mathematical foundations of quantum theory.
peterjaybee said: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.