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arXiv 1107.2007math.CA
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具有显式误差项的Bessel函数的渐近性

Some asymptotics for the Bessel functions with an explicit error term

Ilia Krasikov

摘要:

我们证明了如何从适当的上界出发,得到满足二阶微分方程的具有非常明确的误差项的特殊函数的渐近表达式。我们将计算出贝塞尔函数$J_ν(x)$和艾里函数$Ai(x)$的细节,并找到它们零点的精确逼近。我们还回答了Olenko提出的问题,证明了对于某些显式数值常数$c_1$和$c_2.$,$$c_1 | ν^2-1/4\,| < \sup_{x \ge 0} x^{3/2}|J_ν(x)-\sqrt{\frac{2}{πx}} \, \cos (x-\frac{πν}{2}-\fracπ{4}\,)| <c_2 |ν^2-1/4\,|, $$ $ ν\ge -1/2 \, ,$

英文摘要:

We show how one can obtain an asymptotic expression for some special functions satisfying a second order differential equation with a very explicit error term starting from appropriate upper bounds. We will work out the details for the Bessel function $J_ν(x)$ and the Airy function $Ai(x)$ and find a sharp approximation for their zeros. We also answer the question raised by Olenko by showing that $$c_1 | ν^2-1/4\,| < \sup_{x \ge 0} x^{3/2}|J_ν(x)-\sqrt{\frac{2}{πx}} \, \cos (x-\frac{πν}{2}-\fracπ{4}\,)| <c_2 |ν^2-1/4\,|, $$ $ ν\ge -1/2 \, ,$ for some explicit numerical constants $c_1$ and $c_2.$

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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