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A straightening law for the Drinfel'd Lagrangian Grassmannian
The Drinfelād Lagrangian Grassmannian compactiļ¬es the space of algebraic maps of ļ¬xed degree from the projective line into the Lagrangian Grassmannian. It has a natural projective embedding arising from the highest weight embedding of the ordinary Lagrangian Grassmannian, and one may study its deļ¬ning ideal in this embedding.The Drinfelād Lagrangian Grassmannian is singular. However, a concrete description of generators for the deļ¬ning ideal of the Schubert subvarieties of the Drinfelād Lagrangian Grassmannian would implythat the singularities are modest. I prove that the deļ¬ning ideal of any Schubert subvariety is generated by polynomials which give a straightening law on an ordered set. Using this fact, I show that any such subvariety is Cohen-Macaulay and Koszul. These results represent a partial extension of standard monomial theory to the Drinfelād Lagrangian Grassmannian