On a notion of toric special linear systems

Abstract

In this note, we study linear systems on complete toric varieties X with an invariant point whose orbit under the action of Aut(X) contains the dense torus T of X. We give a characterization of such varieties in terms of its defining fan and introduce a new definition of expected dimension of linear systems which consider the contribution given by certain toric subvarieties. Finally, we study degenerations of linear systems on these toric varieties induced by toric degenerations.