Inspired by Caleb Townsend
Calculus
Level
3
At how many points is the following function (over the reals) not differentiable?
\[ f(x) = \begin{cases} 0, & x \leq 0 \\ x^2, & 0<x \leq 1 \\ 1, & x > 1 \end{cases} \]
by
Calvin Lin