Calculus 1 = differential calculus
Calculus 2 = integral calculus and infinite series
Calculus 3 = multivariate calculus
Calculus 2 = backward calculus
Calculus 3 = n dimensional calculus
Differential Equations = inside out calculus
Complex Analysis = imaginary calculus
That was my favorite course.
I remember going back over the derivation and integration proofs while taking Real II and feeling like that was when they finally clicked.
I was working as a math tutor at the time and Real Analysis was actually a lot of help when trying to explain concepts in Calc I and II.