Generating functional
= Generating functional
{title2=$Z[J]$}
{wiki}
A generating functional is a <path integral> with a source $J$ coupled to a field. Its <functional derivatives> with respect to $J$ generate time-ordered correlation functions.
= Generating functional
{title2=$Z[J]$}
{wiki}
A generating functional is a <path integral> with a source $J$ coupled to a field. Its <functional derivatives> with respect to $J$ generate time-ordered correlation functions.