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arXiv math/0609485math.AGmath.GT
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极实Algebraic Geometry与A-判别式

Extremal Real Algebraic Geometry and A-Discriminants

Alicia Dickenstein, J. Maurice Rojas, Korben Rusek, Justin Shih

摘要:

我们提出了一个新的,简单得多的家庭的反例Kushnirenko的猜想。一路上,我们说明了一个计算机辅助的方法来寻找稀疏多项式系统最大的许多实根,从而揭示了最佳的上界的性质,在真正的fewnomial理论。我们使用一个强大的最近公式的A-判别,并给出新的界限的拓扑结构的某些A-判别品种。后一结果的一个结果是由稀疏多项式方程定义的某些实代数集的拓扑型的数目的一个新的上界,例如,在某些实代数曲面族中可达到的光滑拓扑型的数目。

英文摘要:

We present a new, far simpler family of counter-examples to Kushnirenko's Conjecture. Along the way, we illustrate a computer-assisted approach to finding sparse polynomial systems with maximally many real roots, thus shedding light on the nature of optimal upper bounds in real fewnomial theory. We use a powerful recent formula for the A-discriminant, and give new bounds on the topology of certain A-discriminant varieties. A consequence of the latter result is a new upper bound on the number of topological types of certain real algebraic sets defined by sparse polynomial equations, e.g., the number of smooth topological types attainable in certain families of real algebraic surfaces.

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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