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arXiv 2111.09623math.CA
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Mathieu指数级数的渐近展开

The asymptotic expansion of a Mathieu-exponential series

R B Paris

摘要:

我们考虑$λ>0$和$μ\geq0$的函数列\[S_μ^\pm(a;λ)=\sum_{n=0}^\infty \frac{(\pm 1)^n e^{-λn}}{(n^2+a^2)^μ}\]在扇区$|\arg\,a|<π/2$中的渐近展开为$|a|\to \infty$.该方法将$S_μ^\pm(a;λ)$表示为围道积分,并对积分路径进行适当的变形,数值例子说明了所得到的各种展开式的精度。

英文摘要:

We consider the asymptotic expansion of the functional series \[S_μ^\pm(a;λ)=\sum_{n=0}^\infty \frac{(\pm 1)^n e^{-λn}}{(n^2+a^2)^μ}\] for $λ>0$ and $μ\geq0$ as $|a|\to \infty$ in the sector $|\arg\,a|<π/2$. The approach employed consists of expressing $S_μ^\pm(a;λ)$ as a contour integral combined with suitable deformation of the integration path. Numerical examples are provided to illustrate the accuracy of the various expansions obtained.

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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