The general Grassmannian reconstruction conjecture

Let 1r<n1\leq r<n and let fE:Gr(n,r)M(E)f_E:\operatorname{Gr}(n,r)\rightarrow \mathcal{M}(E) be the morphism obtained from the tilting-bundle construction.

General Grassmannian reconstruction conjecture. For any 1r<n1\leq r<n, the morphism

fE:Gr(n,r)M(E)f_E:\operatorname{Gr}(n,r)\rightarrow \mathcal{M}(E)

is an isomorphism.

The result is proved in the paper for r=2r=2. In general, the tilting quiver and a surjective homomorphism to the endomorphism algebra are known, but an explicit system of relations and a compatible Pieri system remain to be constructed, making the general case combinatorially challenging.

Sources & referencesView supporting material

Primary source

James Green, “Reconstructing the Grassmannian of lines from Kapranov's tilting bundle”, arXiv:1911.12671 (2020).

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