Which for sure, you're not gonna be continuous if F is not defined at C. Well if F is not defined at C, then this part of the expression wouldn't even make sense. So you definitely wouldn't be differentiable. But now let's ask another thing. I've just given you good arguments for when you're not continuous, you're not going to be differentiable. But can we make another claim that if you are continuous, then you definitely will be differentiable? Well it turns out that there are for sure many functions, an infinite number of functions, that can be continuous at C but not differentiable. So for example, this could be an absolute value function.