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arXiv 1101.0169math.AP
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定量形式的等周不等式的最佳常数

Best constants for the isoperimetric inequality in quantitative form

Marco Cicalese, Gian Paolo Leonardi

摘要:

证明了$R^n$中一类定义在Borel集上的泛函极小解的存在性和正则性。将这些结果与作者在arXiv:0911.0786中引入的选择原理的改进相结合,我们描述了一种适合于确定具有高阶项的定量等周不等式中最佳常数的方法.然后,应用Bonnesen的环形对称化在一个非常基本的方式,我们表明,对于$n=2$,上述常数可以明确地计算通过一个单参数家庭的凸集称为椭圆形。这证明了霍尔在J. Reine Angew中提出的一个猜想的进一步扩展。Math.428(1992)。

英文摘要:

We prove existence and regularity of minimizers for a class of functionals defined on Borel sets in $R^n$. Combining these results with a refinement of the selection principle introduced by the authors in arXiv:0911.0786, we describe a method suitable for the determination of the best constants in the quantitative isoperimetric inequality with higher order terms. Then, applying Bonnesen's annular symmetrization in a very elementary way, we show that, for $n=2$, the above-mentioned constants can be explicitly computed through a one-parameter family of convex sets known as ovals. This proves a further extension of a conjecture posed by Hall in J. Reine Angew. Math. 428 (1992).

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