Abstract
We pose and solve the equivalence problem for subspaces of Pn, the (n + 1) di- mensional vector space of univariate polynomials of degree n. The group of interest is SL2 acting by projective transformations on the Grassmannian variety GkPn of k-dimensional subspaces. We establish the equivariance of the Wronski map and use this map to reduce the subspace equivalence problem to the equivalence problem for binary forms.
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