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Article

Semi-infinite Plücker Relations and Weyl Modules

International Mathematical Research Notices. 2020. No. 14. P. 4357-4394.
Feigin E., Makedonskyi I.

The goal of this paper is two-fold. First, we write down the semi-infinite Plücker relations, describing the Drinfeld–Plücker embedding of the (formal version of) semi-infinite flag varieties in type A. Second, we study the homogeneous coordinate ring, that is, the quotient by the ideal generated by the semi-infinite Plücker relations. We establish the isomorphism with the algebra of dual global Weyl modules and derive a new character formula.