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arXiv 0902.1072math.COmath.AG
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组合数学与热带交点的亏格及Ehrhart理论

Combinatorics and Genus of Tropical Intersections and Ehrhart Theory

Reinhard Steffens, Thorsten Theobald

摘要:

令$g_1, ..., g_k$是具有牛顿多面体$P_1, ..., P_k$的$n$变量的热带多项式。研究了由$g_1, ..., g_k$定义的热带超曲面的交的组合问题,如$f$ -向量、无界面的个数和(曲线的情况下)亏格.我们的出发点是维格兰的工作谁认为特殊情况下$k=n-1$和所有牛顿多面体是标准的单纯形。我们将这些结果推广到任意$k$和任意Newton多面体$P_1, ..., P_k$。这提供了新的公式的面数和混合体积方面的亏格。通过建立一些方面的混合版本的Ehrhart理论,我们表明,属的热带相交曲线等于属的复曲面相交曲线对应于相同的牛顿多面体。

英文摘要:

Let $g_1, ..., g_k$ be tropical polynomials in $n$ variables with Newton polytopes $P_1, ..., P_k$. We study combinatorial questions on the intersection of the tropical hypersurfaces defined by $g_1, ..., g_k$, such as the $f$-vector, the number of unbounded faces and (in case of a curve) the genus. Our point of departure is Vigeland's work who considered the special case $k=n-1$ and where all Newton polytopes are standard simplices. We generalize these results to arbitrary $k$ and arbitrary Newton polytopes $P_1, ..., P_k$. This provides new formulas for the number of faces and the genus in terms of mixed volumes. By establishing some aspects of a mixed version of Ehrhart theory we show that the genus of a tropical intersection curve equals the genus of a toric intersection curve corresponding to the same Newton polytopes.

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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