So, by this property, the group laws are different for every curve shape.

Designing a curve shape into the front of the banner stabilises it into the correct shape in flight.

This reverse curve shape made it easier to thread the intended thick material end over the bar.

It describes the local properties (edges, corners, etc.) and relations between the first and second derivative, and thus, the precise curve shape.

This theory explains the predominance of the normal yield curve shape.