Regions of any deformation of a graphical arrangement are bijectively labeled by weighted digraphs containing only negative-weight directed cycles, with bounded regions corresponding to strongly connected digraphs.
Whitney, A logical expansion in mathematics, Bull
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Labeling regions in deformations of graphical arrangements
Regions of any deformation of a graphical arrangement are bijectively labeled by weighted digraphs containing only negative-weight directed cycles, with bounded regions corresponding to strongly connected digraphs.