逆误差函数导数的渐近分析
Asymptotic analysis of the derivatives of the inverse error function
摘要:
逆的误差函数,$\operatorname{inverf}(x),$扩散问题,化学势,超声成像等,我们分析的衍生物$\frac{d^{n}}{dz^{n}} \operatorname*{inverf}(z) |_{z=0}$,作为$n\to \infty$使用嵌套衍生物和离散射线方法的应用。通过对$x=0$的高阶Taylor展开,得到了$\operatorname{inverf}(x)$的一个很好的近似.我们给出的数值结果表明我们的公式的准确性。
英文摘要:
The inverse of the error function, $\operatorname{inverf}(x),$ has applications in diffusion problems, chemical potentials, ultrasound imaging, etc. We analyze the derivatives $\frac{d^{n}}{dz^{n}} \operatorname*{inverf}(z) |_{z=0}$, as $n\to \infty$ using nested derivatives and a discrete ray method. We obtain a very good approximation of $\operatorname{inverf}(x)$ through a high-order Taylor expansion around $x=0$. We give numerical results showing the accuracy of our formulas.
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