feynlag.export.ufo.vvvv.structures_from_metric_pairs¶

feynlag.export.ufo.vvvv.structures_from_metric_pairs(c12, c13, c14, simplifier=<function simplify>)[source]¶

{VVVV1/2/3: coeff} for c12*M12M34 + c13*M13M24 + c14*M14M23.

Raises:: ValueError – if c12 + c13 + c14 != 0, i.e. the vertex has a piece outside the span of the three catalog structures.