And most importantly, it's approaching a very different value from the right. This expression is approaching a very different value from the right as it is from the left. And so in this case, this limit up here won't exist. So we can clearly say this is not differentiable. So once again, not a proof here. I'm just getting an intuition for, if something isn't continuous, it's pretty clear, at least in this case, that it's not going to be differentiable. Let's look at another case.