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@sebastianJaeger could you have a look at the text here? Perhaps easiest to review the notebook in ReviewNB:
https://app.reviewnb.com/ComPWA/qrules/blob/ls-coupling/docs/usage/ls-coupling.ipynb

There were still some mistakes in the example calculation. They are fixed in 1fd6e5c.

1fd6e5c also introduces some code to demonstrate that QRules returns the same LS-combinations. It would be better to illustrate each step in the derivation with functions from the conservation_rules module, but the current interface does not really allow for any illustrative code samples. The solution would be to expose some of the domain generation functions used by the StateTransitionManager (not sure if this is even possible) and use those to find all allowes LS-combinations.

Another problem: 1fd6e5c requires strip_spin and render_node, which is currently not allowed. This will be fixed in another PR.