conformal geometry

Short definition from Wiktionary

Noun

1. 1
   The study of conformal (angle-preserving) transformations on a space;
2. 2
   The study of conformal (angle-preserving) transformations on a space; (formally) an ordered pair comprising a space and the group of conformal transformations that act on the space: an ordered pair comprising a space and the group of conformal transformations that act on the space.