conformal geometry

Etymology
🇰🇲

Noun

 * 1)  The study of conformal (angle-preserving) transformations on a space;  an ordered pair comprising a space and the group of conformal transformations that act on the space.
 * 2) * 2000, Boris N. Apanasov, Conformal Geometry of Discrete Groups and Manifolds, Walther de Gruyter, page vii,
 * Generally, conformal geometries naturally appear at infinity for negatively curved Riemannian geometries. Moreover, due to 's [5, 6] geometric approach to infinite groups, conformal geometry invents new fruitful methods in combinatorial group theory.