Playing tricks with 2-variable limits
Oh hey look, a function!
0:00 Intro
1:57 Counterexamples to checking some straight lines
3:40 Counterexample to checking all straight lines
4:39 A more 'natural' counterexample (and touching grass)
6:54 Outro
The graphing program used in this video is the Grapher app that comes with Mac computers.