Definition:
Suppose $f(x)$ is defined for all $x$ near $a$ (possibly
excluding $a$). $$ \lim_{x \rightarrow a} f(x) = L$$ (read:
"the limit of $f(x)$, as $x$ approaches $a$, equals $L$")
means that we can get $f(x)$ as close to $L$ as we want by
making $x$ sufficiently close to $a$. |