[Lesson 27.5 optional] QED Prerequisites Scattering 4.5 An application of Cauchy's Theorem

THis is a supplemental lecture to Scattering 4. In this lesson we practice using complex contour integration to evaluate one of the standard integrals used in the development of the formula of stationary phase. This lesson exercises the use of Cauchy's Theorem and Jordan's Lemma.

Note: there is a typo at the beginning: the standard result integral should have Pi/4 in the exponent, not Pi/2. I corrected this in the last lesson, but forgot to mention it this time.

The software I usually use to produce the lectures is:

[nihargupte]

Easily the best Theory lecturer on YouTube

[yuvraj]

I used to watch your gtr videos, back then your videos only got like 2-3 views, hope you feel better about the number of views now.

[jy_decipherer_]

It’s funny how you can just plug iα into the solution of the real-valued Gaussian integral, yet the actual way to solve it takes a 43-minute lecture to go through

[jacquessmeets]

part of the video is unreadable because not sharp (out of focus). Can you pay attention to that? Thanks in advance.

[theorist_]

I think you missed lec 21 or may be I'm wrong