Noun
a subset of a graph (or a subdiagram) that causes a divergence in an otherwise complex, multiloop calculation
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More examples (1)
The contribution from #92;mathcal#123;E#125;#95;#123;D²#92;mathcal#123;R#125;⁴#125;, the coefficient function of an amplitude that vanishes onshell, arises from a two loop nested subdivergence of the three loop amplitude..