For every skew Ferrers bipartite graph, the binomial edge ring has a quadratic Sagbi/Grobner presentation, is Koszul, Cohen Macaulay, normal, and its dimension is the number of NW and SE perimeter cells.
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Binomial edge rings associated to skew Ferrers diagrams
For every skew Ferrers bipartite graph, the binomial edge ring has a quadratic Sagbi/Grobner presentation, is Koszul, Cohen Macaulay, normal, and its dimension is the number of NW and SE perimeter cells.