Explicit Use of Complex Analysis in Physics: What Courses?

[Nusc]

Can someone tell me when explicit use of complex analysis arises in physics?

What particular courses?

Thanks

 

[misogynisticfeminist]

Mostly QM...in fact CA is extremely useful for physics in general.

 

[Tide]

Electromagnetic wave propagation; analysis & asymptotic analysis of functions; perturbation analysis;