Infection point?
Just what the Hell is that supposed to mean?
Where is the Princess Diaries Guy?
A relative maximum is a local peak of a function. A relative minimum is a local valley of a function. The inflection point is the point at which the function turns from concave up, say, to concave down. So it’s a type of turning point.
I’d be surprised if Mitt knows all that much about differential calculus though.