1. The problem statement, all variables and given/known data find points where function is differentiable http://puu.sh/cqrc8/f96bd06aee.png [Broken] 2. Relevant equations H(x) = 1, x >= 0 H(x) = 0, x < 0 3. The attempt at a solution i Draw a number line and see where the function would change or jump. and immediately i noticed that the function would not be continous on x=0 and x=2 since that is when the function jumps. http://puu.sh/cqrBE/44b7fe56ff.png [Broken] however i don't see any other discontinuities in the function. if so then what is the last note for??? Am i completely missing the point in this question here??