point of inflection
A point where a plane curve changes from the concave to the convex relative to some fixed line; equivalently, if the function determining the curve has a second derivative, this derivative changes sign at this point. Also known as inflection point.
point of contraflexure
A point at which the direction of bending changes. Also known as point of inflection.
So, Don't confuse. All POC is POI but all POI is not POC
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