- [Introducing Cone](Introducing%20Cone.md) - [Polar Cone](Polar%20Cone.md) - [wiki](https://en.wikipedia.org/wiki/Dual_cone_and_polar_cone) --- ### **Intro** The dual cone of a set $C$ is denoted as $C^\star$. By definition it's the opposite of the polar cone: $ C^\star = - C^\circ. $