point is a point but point is a point

An inflection point is not a saddle point, but a saddle point is an inflection point.

To be precise, a saddle point is both a stationary point and an inflection point. An inflection point is a point at which the curvature changes sign, so it is not necessary to be a stationary point.

the seamster

She went point-by-point in the lecture. He highlighted the formula point-by-point.

If the point is nothing, then...

Nothing is the point!

(There is no point?)

I'm confused