Let Sy=f(x)$ be a real-valued function. Recall that $\im _{x ightarrow c) f(x)=L$ if $$ forall Warepsilon>)(\exists (delta> (forall ~ \in \mathbb {R}) P\varepsilon, delta, x) $$ where $P(\varepsilon, \delta, x)$ is the conditional statement $$ (0