Truncated Grassmannians describe blow-ups of Grassmannians along Schubert varieties, with projection fibers given by spaces of collineations.
Feigin, Birational maps, PBW degenerate flags and poset polytopes, Journal of Algebra, vol
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Truncated Grassmannians, blow-ups along Schubert varieties and collineations
Truncated Grassmannians describe blow-ups of Grassmannians along Schubert varieties, with projection fibers given by spaces of collineations.