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Diagram Builder

SU(2)-Chern-Simons invariants
then drag the ⚭ plug between two vertices to add a propagator
How it maps: connect vertices into a tree and it computes as one engine call — the direction you draw each propagator is only visual. A plain line reproduces H2…/H3…_General exactly; longer lines are the verified general chain. A branch (a vertex with 3+ propagators) is also supported and verified by reduction: switching a branch off collapses it exactly to the corresponding chain. Loops (closed cycles) aren't supported.

Inspector

Select a vertex to edit its legs, or a propagator label to set its bridge value.

Engine call

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