Suppose there is a curve that is already parametrized.
It is called $C^0$ continuity because there is a kink.
There are three places. which are $C^0$ $C^1$ $C^0$ respectively.
Here are the questions.
Can we say "it is $C^2$ if we didn't consider those three place"?
We have terminology "kink" to say $C^0$ place. What is the terminology to say $C^1$ place?