Let Sy=f(x)$ be a real-valued function. Recall that $\lim _{x ightarrow c) f(x)=L$ if $$ (\forall Warepsilon>0) (\exists \delta>)(\forall x \in \mathbb {R}) P(\varepsilon, \delta, x) $$ where $P(\varepsilon, \delta, x)$ is the conditional statement $$ (6