schwinger_dyson.tex

   \left\langle\psi\left|\mathcal{T}\left\{\frac{\delta}{\delta\phi}F[\phi]\right\}\right|\psi\right\rangle = -\mathrm{i}\left<\psi\left|\mathcal{T}\left\{F[\phi]\frac{\delta}{\delta\phi}S[\phi]\right\}\right|\psi\right>