I’m sorry for this awkward question, but I don’t know how else I should explain it, I tried to do some research online, but couldn’t find anything. For example, the notation looks like: $$\lim_{x \to 2^-}f(x)$$ $$\lim_{x \to 2^+}f(x)$$

  • 1
    $\begingroup$ See this. $\endgroup$ Aug 19, 2018 at 18:08

1 Answer 1


It's just a way to know what limit you are going to find. When it has a minus sign at the top it means that you must find the limit when the desired $x$ comes from the left, meaning that you must find which number the limit goes as $x$ becomes more closer to $x_0$ from the left. Something similar applies to the positive sign meaning that you find the limit as you come closer to the number of the limit from the right.


You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .