Multigraded Apolarity

Maciej Gałązka

Published 2016-01-23Version 1

We generalize methods to compute various kinds of rank to the case of a toric variety $X$ embedded into projective space using a very ample line bundle $\mathcal{L}$. We use this to compute rank, border rank, and cactus rank of monomials in $H^0(X, \mathcal{L})^*$ when $X$ is the Hirzebruch surface $\mathbb{F}_1$, the weighted projective plane $\mathbb{P}(1,1,4)$, or a fake projective plane.