And actually, we'll look at a case where it's not necessarily the case the other way around, that if you're continuous, then you're definitely differentiable. But another way to interpret what I just wrote down is if you are not continuous, then you definitely will not be differentiable. If F not continuous at X equals C, at X equals C, then F is not differentiable. Differentiable at X is equal to C. So let me give a few examples of a non-continuous function. And then think about would we be able to find this limit? So the first is where you have a discontinuity. Our function is defined at C. It's equal to this value.