I need to prove the following:
Let Sn be a sequence in R. If s in R and for every e > 0, there exists n' in N s.t. Sn < s + e for all n >= n', prove that Lim superior Sn <= s
Here is how I am approaching it:
first, Sn - s < e -> s is the limit of Sn as n-> infinity.
I also know that Lim Superior Sn = inf (sup[Sn:n>=k])
So, maybe I could use both to say that Lim Sup (Sn) is either s or less than s
What do you think?