= One-particle-reducible Feynman diagram
= 1PR Feynman diagram
{c}
{synonym}
A connected <Feynman diagram> is one-particle reducible if cutting one internal propagator disconnects it. These diagrams occur in <connected correlation functions> but do not contribute to a <quantum effective action> defined by a <Legendre transform>. For a strict <Wilsonian effective action>, a bridge also cannot be a high-momentum propagator when the sum of external momenta on one side lies below the integrated shell.
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