Semiampleness criteria for divisors on overline M_(0,n)
classification
🧮 math.AG
math.COmath.OC
keywords
overlinecriteriadivisorssemiamplesemiamplenessapplicationassociatebalancedness
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We develop new characteristic-independent combinatorial criteria for semiampleness of divisors on $\overline{M}_{0,n}$. As an application, we associate to a cyclic rational quadratic form satisfying a certain balancedness condition an infinite sequence of semiample line bundles. We also give several sufficient and effective conditions for a symmetric divisor on $\overline{M}_{0,n}$ to be semiample or nef.
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