Combinatorial Seshadri stratifications on normal toric varieties

Abstract

We apply the theory of Seshadri stratifications to embedded toric varieties $X_P\subseteq \mathbb{P}(V)$ associated with a normal lattice polytope $P$. The approach presented here is purely combinatorial and completely independent of \cite{CFL}. In particular, we get a close connection between a certain class of triangulations of the polytope $P$, Seshadri stratifications of $X_P$ arising from torus orbit closures, and the associated degenerate semi-toric varieties. In the last section we show that the approach here and the one in \cite{CFL} produce the same quasi-valuations and hence the same degenerations of $X_P$.

v2: typo corrected, 31 pages, to appear in Journal of Algebra 60th anniversary volume