Chapter 2.7, Problem 57E

a.

To determine

To write: An analogous formal definition for $\underset{x\to a^{+}}{\lim }f\left(x\right)=\infty$.

b.

To determine

To write: An analogous formal definition for $\underset{x\to a^{-}}{\lim }f\left(x\right)=-\infty$.

c.

To determine

To write: An analogous formal definition for $\underset{x\to a^{-}}{\lim }f\left(x\right)=\infty$.