Originally Posted by
Drexel28 I don't really know what you're questions asking, but assuming you're asking "when" you take complex analysis the answer varies. Theoretical complex analysis is usually taught at a graduate level, usually on the very vague magnitude that if 504 and 505 are the basic grad analysis courses (not measure theory or functional, just basic mathematical analysis) then 601 and 602 are the graduate complex analysis courses. That said, the kind of complex analysis you're probably mentioning is easily accessible right after multivariate calculus if one just accepts the theorems (maybe PDEs and vector calc would help though).