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arxiv: 1712.08077 · v1 · pith:HON6NBJUnew · submitted 2017-12-21 · 🧮 math.CV · math.FA

Mixed Bohr radius in several variables

classification 🧮 math.CV math.FA
keywords alphabohrradiusvariablesdenotesdimensionaleverymixed
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Let $K(B_{\ell_p^n},B_{\ell_q^n}) $ be the $n$-dimensional $(p,q)$-Bohr radius for holomorphic functions on $\mathbb C^n$. That is, $K(B_{\ell_p^n},B_{\ell_q^n}) $ denotes the greatest constant $r\geq 0$ such that for every entire function $f(z)=\sum_{\alpha} c_{\alpha} z^{\alpha}$ in $n$-complex variables, we have the following (mixed) Bohr-type inequality $$\sup_{z \in r \cdot B_{\ell_q^n}} \sum_{\alpha} | c_{\alpha} z^{\alpha} | \leq \sup_{z \in B_{\ell_p^n}} | f(z) |,$$ where $B_{\ell_r^n}$ denotes the closed unit ball of the $n$-dimensional sequence space $\ell_r^n$. For every $1 \leq p, q \leq \infty$, we exhibit the exact asymptotic growth of the $(p,q)$-Bohr radius as $n$ (the number of variables) goes to infinity.

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