So in our domain, as long as x is larger than 2 thirds, we are concave upwards. And we saw that here. At x is equal to 1, we were concave upwards. But what about x being less than 2 thirds? So when x is less than 2 thirds, let me write it, let me scroll down a little bit. When x is less than 2 thirds, what's going on? I'll rewrite it.