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math.AG2024
Birational maps, PBW degenerate flags and poset polytopes
Evgeny Feigin
We extend the results on the graph closures of the birational maps between projective spaces and Grassmannians to the case of PBW degenerate flag varieties. The advantage of the PB…
math.AG2024
Birational maps to Grassmannians, representations and poset polytopes
Evgeny Feigin, with an appendix in collaboration with Wojciech Samotij
We study the closure of the graph of the birational map from a projective space to a Grassmannian. We provide explicit description of the graph closure and compute the fibers of th…