Let's suppose we wish to calculate:(adsbygoogle = window.adsbygoogle || []).push({});

[tex] PV \int_{0}^{\infty}dx\frac{e^{-sx}}{1-x} [/tex] (1)

I don't know how to do it, my idea is take the identity:

[tex] \frac{1}{1-x}=1+x+x^{2}+x^{3}+............ |x|<1 [/tex]

[tex] \frac{1}{1-x}=-x^{-1}-x^{-2}-x^{-3}+x^{3}+............ |x|>1 [/tex]

So (1) using Cauchy's principal value, is the same as to calculate with a positive small epsilon:

[tex] \int_{0}^{1-\epsilon}dxx^{k} e^{-sx} [/tex]

[tex] \int_{1+\epsilon}^{\infty}dxx^{-k} e^{-sx} [/tex]

and calculate term by term integration to get the Principal value of (1)

**Physics Forums - The Fusion of Science and Community**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Evaluating this integral (Principal value)

Can you offer guidance or do you also need help?

Draft saved
Draft deleted

Loading...

Similar Threads - Evaluating integral Principal | Date |
---|---|

I Evaluation of a line integral | Sep 14, 2017 |

I Evaluating improper integrals with singularities | Mar 15, 2017 |

A Who can help evaluate this integral? | Oct 10, 2016 |

I How to evaluate this integral? | Aug 22, 2016 |

A Evaluation of a horrible Multiple Integral | Apr 6, 2016 |

**Physics Forums - The Fusion of Science and Community**