Find the $\inf, \sup, \min, \max$, the interior and the closure of the set $\{1/2, -2/3, 3/4, -4/5,\ldots\}$
So I am sure I found the right inf and sup that being $-1$ and $1$ and the min and max do not exist because sup and inf are not included in the set, but I'm not sure about how I should find the interior and the closure.
So any help would be accepted. I know the definitions but I'm not sure I can quite compute them.