c (source code)
= c
{scope}
For the <two-point function>, the original <Feynman diagrams> below show both one-vertex graphs and every two-vertex topology with external <momentum> flowing between distinct <interaction vertices>. All lines represent the same <real scalar field>. The lower row labels the number of parallel connecting lines; a small closed line at a vertex is a <tadpole diagram>.
\Image[/past-exam-of-the-quantum-field-theory-course-of-the-university-of-oxford/2021-scalar-self-energy-diagrams.png]
{title=One-vertex self-energies and the four momentum-dependent two-vertex topologies in the three-dimensional quartic-sextic scalar theory.}
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