Is it necessarily that an inflection point always the mid-point between two critical points for any twice differentiable function?
I have seen this in YouTube video related to concavity, I fully understand what is inflection point, it is the point where concavity changes (concave up then concave down) or (concave down then concave up). What is the truth of the statement above? Is there any proof or disproof?
Any help would be appreciated. THANKS!