alexyar replied to your post: alexyar replied to your post: alexyar replied to...
âreplace x with 1/yâ so likeâŠdivide by x? :D
Replace, not divide. Â So that your limit as x approaches infinity becomes a limit as y approaches zero. Â I know how to do series expansions around zero.
(This is actually something that comes up in modular forms a lot, I think---you want the series expansion at infinity, so you write out the series in the variable q = 1/z).



















