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arXiv 0906.1827math.CVmath-phmath.MP
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零自由域上全纯函数的估计

Estimates of holomorphic functions in zero-free domains

Alexander Borichev, Vesselin Petkov

摘要:

研究了上半平面上全纯的无零点函数f(z),当z的虚部在0和1之间时,得到了f(z)在这条带上模的一个下界.在我们的分析中,我们处理了纯量函数f(z)以及算子值的全纯函数I+A(z),假设A(z)是上半平面中的迹族算子,并且I+A(z)在同一条上可逆且在实直线上酉。

英文摘要:

We study functions f(z) holomorphic in the upper half plane and having no zeros when the imaginary part of z is between 0 and 1, and we obtain a lower bound for the modulus of f(z) in this strip. In our analysis we deal with scalar functions f(z) as well as with operator valued holomorphic functions I+A(z) assuming that A(z) is a trace class operator in the upper half plane and I+A(z) is invertible in the same strip and is unitary on the real line.

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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