I don't know how to properly present my answer to find the limit of a converging sequence like (1/2)^n. I would just write something like this... y=1/x+1, x=∞ } y=1/∞+1=0+1=1 but the syllabus gives something completely different and my text books don't seem to cover this portion of the syllabus. This is the syllabus for A-level mathematics in the UK, presumably the equivalent of precalculus. http://www.suffolkmaths.co.uk/pages/A-Level%20Activities/Menus/Pure.htm [Broken] press ctrl+f then type "finding" and you come across this Iterative formulae To include their use in finding of a limit L as n → ∞ by putting L = f(L) I'm not entirely sure what it means by "by putting L = f(L)". I get the impression this means substituting n for ∞ to find whether a sequence is periodic, divergent or convergent and it's limits if it has them but I have no idea what a "iterative formulae" is, neither do I know the proper notation I need to present my working. I can't find any examples of proper notation to follow and make sure I'm communicating my answer properly. I've been checking for quite a while now on the internet but I can't find any examples and I would appreciate some help.