calculate the complex integral limit \(\displaystyle\lim_{{{T}\to\infty}}{\frac{{{1}}}{{{2}\pi{i}}}}{\int_{{{c}-{i}{T}}}^{{{c}+{i}{T}}}}{\frac{{{x}^{{s}}}}{{{s}^{{{k}+{1}}}}}}{d}{s}\) where \(\displaystyle{c}{>}{0}\)

Reilly Knox

Reilly Knox

Answered question

2022-03-17

calculate the complex integral limit
limT12πiciTc+iTxssk+1ds
where c>0 and k1 is an integer.

Answer & Explanation

Jakayla Hayes

Jakayla Hayes

Beginner2022-03-18Added 7 answers

Let γ be the counter-clockwise semi-circular path going from c+iT to c-iT. Along γ, |xs|=|eslogx|=exp(R(slogx)) is bounded by |xc|, while |s|(Tc), hence:

and the value of the starting integral is just the residue in s=0 of xssk+1, i.e.:
limT+12πiciTc+iTxssk+1ds=log(x)kk!.

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