# Dyson Schwinger equation

given the Dyson equations

$\frac{\delta S}{\delta \phi(x)}\left[-i \frac{\delta}{\delta J}\right]Z[J]+J(x)Z[J]=0$

is true that they are a solution or differential representation of the Generating functional ?? $Z[J]=\int d[\phi(x)]exp(iS[\phi(x)])-\int dxZ[J]\phi(x)$ ??

if i can solve these set of equation can i 'renormalize' a physical theory ??

How are the Schwinger dyson equation solved ?? , thanks.

are these set of equation similar to 'Schwinger's quantum action principle ' ??

$\delta <A|B>_{J}=i<A|\delta S |B>_{J}$ the variation is made respect an external source $J(x)$

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