Multiplicities in sl_2 branching laws are constant in regions of parameter space bounded by piecewise-linear fences, unifying classical rules such as the Pieri rule and fusion rules.
Kobayashi,Restrictions of generalized Verma modules to symmetric pairs, Transform
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Stability of Multiplicities in Symmetry Breaking: The sl_2 Case
Multiplicities in sl_2 branching laws are constant in regions of parameter space bounded by piecewise-linear fences, unifying classical rules such as the Pieri rule and fusion rules.