We prove that for smooth projective toric varieties, the Okounkov body of a T-invariant pseudo-effective divisor with respect to a T-invariant flag decomposes as a finite Minkowski sum of indecomposable polytopes, and that the set of these polytopes corresponds to a finite Minkowski basis whose elements span the extremal rays in the secondary fan. In fact, the Minkowski basis does not depend on the choice of the T-invariant flag. Moreover, we present an algorithm that computes the Minkowski basis.
Minkowski decomposition and generators of the moving cone for toric varieties
URBINATI, STEFANO
2015-01-01
Abstract
We prove that for smooth projective toric varieties, the Okounkov body of a T-invariant pseudo-effective divisor with respect to a T-invariant flag decomposes as a finite Minkowski sum of indecomposable polytopes, and that the set of these polytopes corresponds to a finite Minkowski basis whose elements span the extremal rays in the secondary fan. In fact, the Minkowski basis does not depend on the choice of the T-invariant flag. Moreover, we present an algorithm that computes the Minkowski basis.File in questo prodotto:
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