This is how I feel during any sort of Math lecture. I always have to go through it all at my own pace later and half the battle is just deciphering what the fuck they're trying to convey half the time.
I will be so glad when my Stats course is over. Just one more week babyyy
if it makes you feel any better, i have a math degree and i still find stats hard to think about. shit's kinda wild and the way it's taught is usually subpar. you're doing well to get through it at any pace.
Math notation is constantly evolving, early systems were very clunky and hard to use.
I have to do calculus and shit for my stats lectures and its a nightmare. I can never understand the first time and then I have to spend ages afterwards looking up what the hell the equations and letters mean
Is the bottom the gamma function? It looks similar to this: https://en.wikipedia.org/wiki/Gamma_function#cite_ref-27
Yes, it is proof of Stirling's formula through Euler-Maclaurin formula.
The proof of the intermediate step is left as an exercise to the reader.
I love it when a book explicitly tells you a step is "obvious", almost as if to call you an idiot for not seeing it.