there so intuitively yeah so it's always I mean if you take a class in convex optimization you'll see that you know half of the class is dedicated to building intuition of how you highball something's comebacks or not and same thing with concave I mean it's the same kind of thing it's hard to say like how intuitively you would do that sort of like working through all those principles and starting to recognize all the patterns in this case we can just plot it so I made an actual precise plot of what it looks like and we'll see that