齐次多项式的Sidon常数
The Sidon constant for homogeneous polynomials
摘要:
n个复变数中非零m-齐次多项式P的指数集的Sidon常数是P的系数的l^1范数与P在D^n中的上确界范数之比的上确界。我们提出了一个估计,它给出了正确的数量级为这个常数,模指数依赖于m的一个因素。我们用这个结果来证明多圆盘D^n的玻尔半径从下到上由一个常数乘以sqrt((log n)/n)来界定。
英文摘要:
The Sidon constant for the index set of nonzero m-homogeneous polynomials P in n complex variables is the supremum of the ratio between the l^1 norm of the coefficients of P and the supremum norm of P in D^n. We present an estimate which gives the right order of magnitude for this constant, modulo a factor depending exponentially on m. We use this result to show that the Bohr radius for the polydisc D^n is bounded from below by a constant times sqrt((log n)/n).
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