Any good examples showing of max/min point can be 0?
mr fantstic nailed it!
is shaped like a parabola, but rises more steeply
. . and is "fatter" near the origin.
Code:| * | * | | * | * | * | * * | * * | * * | * - - - - - - - * - - - - - - - |
There is a minimum at (0,0).
The concavity is 0 because the curve "flattens" slightly there.