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On curves with high multiplicity on mathbb{P}(a,b,c) for min(a,b,c)leq4

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arxiv 2011.10103 v1 pith:M4PNBVG4 submitted 2020-11-19 math.AG

On curves with high multiplicity on mathbb{P}(a,b,c) for min(a,b,c)leq4

classification math.AG
keywords divisormathbbboundscloseconeeffectivemultiplicityample
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On a weighted projective surface $\mathbb{P}(a,b,c)$ with $\min(a,b,c)\leq 4$, we compute lower bounds for the {\em effective threshold} of an ample divisor, in other words, the highest multiplicity a section of the divisor can have at a specified point. We expect that these bounds are close to being sharp. This translates into finding divisor classes on the blowup of $\mathbb{P}(a,b,c)$ that generate a cone contained in, and probably close to, the effective cone.

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