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arXiv 1508.05554math.FA
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Lorentz空间的插值Bohnenblust-Hille不等式

Bohnenblust-Hille inequalities for Lorentz spaces via interpolation

Andreas Defant, Mieczysław Mastyło

摘要:

证明了Lorentz数列空间$\ell_{\frac{2m}{m+1},1}$在~精确意义下是满足$\mathbb{C}^n$上的$m$ -线性型或$m$ -齐次多项式的Bohnenblust-Hille型不等式的对称Banach数列空间中的最优序列.出于这个结果,我们开发的方法来处理微妙的Bohnenblust-Hille型不等式的洛伦兹空间的设置。利用插值方法和混合型空间中的Blei-Fournier不等式,证明了Lorentz空间中具有次多项式和次指数常数的多线性和多项式Bohnenblust-Hille型不等式.改进了Balasubramanian-Calado-Queffélec的一个显著结果,给出了它在狄利克雷级数理论中的应用.

英文摘要:

We prove that the Lorentz sequence space $\ell_{\frac{2m}{m+1},1}$ is, in a~precise sense, optimal among all symmetric Banach sequence spaces satisfying a Bohnenblust-Hille type inequality for $m$-linear forms or $m$-homogeneous polynomials on $\mathbb{C}^n$. Motivated by this result we develop methods for dealing with subtle Bohnenblust-Hille type inequalities in the setting of Lorentz spaces. Based on an interpolation approach and the Blei-Fournier inequalities involving mixed type spaces, we prove multilinear and polynomial Bohnenblust-Hille type inequalities in Lorentz spaces with subpolynomial and subexponential constants. Improving a remarkable result of Balasubramanian-Calado-Queffélec, we show an application to the theory of Dirichlet series.

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