I am studying QFT from Peskin & Schroeder. There I found a physical interpretation of a 2-point correlation function. According to Peskin & Schroeder, the 2-point correlation function is nothing but a propagator between two points and I am happy with that. But the question that arises immediately is, what are the n-point correlation functions?
e.g.- does the 3-point correlation function given by, $\langle\omega|T[\phi(x)\phi(y)\phi(z)]|\omega\rangle$ imply the amplitude of propagation from $x$ to $z$ via $y$?
Is this understanding correct?