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arXiv 1606.07883math.CA
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Touchard多项式的渐近性

The asymptotics of the Touchard polynomials

R B Paris

摘要:

我们研究的渐近展开的Touchard多项式$T_n(z)$(也称为指数多项式)的大$n$和复杂的变量$z$的值。在我们的治疗中,$|z|$可能是有限的,或者允许像$O(n)$一样大。我们采用最速下降法到一个合适的整表示的$T_n(z)$和发现的鞍点,有助于扩展的数量取决于值的$n$和$z$。数值结果说明了各种展开式的准确性。

英文摘要:

We examine the asymptotic expansion of the Touchard polynomials $T_n(z)$ (also known as the exponential polynomials) for large $n$ and complex values of the variable $z$. In our treatment $|z|$ may be finite or allowed to be large like $O(n)$. We employ the method of steepest descents to a suitable integral representation of $T_n(z)$ and find that the number of saddle points that contribute to the expansion depends on the values of $n$ and $z$. Numerical results are given to illustrate the accuracy of the various expansions.

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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