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arXiv 1502.03759math.AG
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热带曲线上的提升拟阵因子

Lifting matroid divisors on tropical curves

Dustin Cartwright

摘要:

热带几何用退化对偶图的组合学给出了曲线上因子秩的一个界。我们表明,对于一个家庭的例子,曲线实现这一界限可能只存在于某些特征或某些领域的定义。我们的例子也适用于度量化复形和加权图的理论。这些例子是通过将提升问题与拟阵可实现性联系起来而产生的。我们还给出了Mnëv普适性的证明,并给出了拟阵大小的明确界,这可能是独立的兴趣。

英文摘要:

Tropical geometry gives a bound on the ranks of divisors on curves in terms of the combinatorics of the dual graph of a degeneration. We show that for a family of examples, curves realizing this bound might only exist over certain characteristics or over certain fields of definition. Our examples also apply to the theory of metrized complexes and weighted graphs. These examples arise by relating the lifting problem to matroid realizability. We also give a proof of Mnëv universality with explicit bounds on the size of the matroid, which may be of independent interest.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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