Posts in MAT 17A
Infinity and DNE in Limits

The best way to approach why we use infinity instead of does not exist (DNE for short), even though they are technically the same thing,  is to first define what infinity means.

Infinity is not a real number. It's a mathematical concept meant to represent a really large value that can’t actually be reached. In terms of solutions of limits, it means that the equation you are taking the limit of will go in that direction forever.

Read More