Definition:Involute/Definition 1

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Definition

Let $\CC$ be a curve embedded in a plane.


Let $\LL$ be the locus of a fixed point on a tangent to $\CC$ as it rolls around $\CC$.

The curve $\LL$ is the involute of $\CC$.


Also see

  • Results about involutes can be found here.


Historical Note

The concept of the involute of a curve in the plane was first introduced by Christiaan Huygens during his analysis of the cycloid in his $1673$ treatise Horologium Oscillatorium sive de Motu Pendularium.


Sources