A simple approach to asymptotic expansions for Fourier integrals of singular functions

作者：Sidi Avram^*

来源：Applied Mathematics and Computation, 2010, 216(11): 3378-3385.

DOI：10.1016/j.amc.2010.04.068

• Fourier integrals
• Fourier series
• Asymptotic expansions
• Singular functions

In this work, we are concerned with the derivation of full asymptotic expansions for Fourier integrals integral(b)(a) f(x)e(+/- isx) dx as s ->infinity, where s is real positive, [a,b] is a finite interval, and the functions f(x) may have different types of algebraic and logarithmic singularities at x = a and x = b. This problem has been treated in the literature by techniques involving neutralizers and Mellin transforms. Here, we derive the relevant asymptotic expansions by a method that employs simpler and less sophisticated tools.

• 出版日期2010-8-1