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Conformal GA

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PGA added one new basis vector and unlocked projective geometry. CGA (Conformal Geometric Algebra) takes this to the extreme: by adding two new basis vectors \(e_-\) and \(e_+\), we can represent circles, spheres, and arbitrary conformal transformations, which unifies hyperbolic, spherical, and Euclidean space. CGA is incredibly powerful.

Conformal sphere

Points, lines, circles, planes, and spheres

Conformal transformations