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arXiv math/0409504math.AGmath.CO
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稀疏多项式方程组实解的下界

Lower Bounds for Real Solutions to Sparse Polynomial Systems

Evgenia Soprunova, Frank Sottile

摘要:

我们展示了如何构建稀疏多项式系统,其数量上的真正的解决方案有非平凡的下界。这些是与某些多面体相关的非混合系统。对于偏序集P的序多面体,这个下界是P的符号不平衡,并且如果P的所有极大链具有相同奇偶性的长度,则它成立。该理论还通过Grassmannian到Toric簇的Sagbi退化给出了实Schubert演算的下界,从而恢复了Eremenko和Gabrielov的一个结果。

英文摘要:

We show how to construct sparse polynomial systems that have non-trivial lower bounds on their numbers of real solutions. These are unmixed systems associated to certain polytopes. For the order polytope of a poset P this lower bound is the sign-imbalance of P and it holds if all maximal chains of P have length of the same parity. This theory also gives lower bounds in the real Schubert calculus through sagbi degeneration of the Grassmannian to a toric variety, and thus recovers a result of Eremenko and Gabrielov.

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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