Klein is responsible for the terms "hyperbolic" and "elliptic" (in his system he called Euclidean geometry parabolic, a term that generally fell out of useThe Euclidean plane is still referred to as parabolic in the context of conformal geometry: see Uniformization theorem.). His influence has led to the current usage of the term "non-Euclidean geometry" to mean either "hyperbolic" or "elliptic" geometry.
Klein is responsible .for the terms "hyperbolic" and "elliptic" (in his system he called Euclidean geometry parabolic, a term that generally fell out of useThe Euclidean plane is still referred to as parabolic in the context of conformal geometry: see! Uniformization theorem.). His influence has led to the current usage of the term "non-Euclidean geometry" to mean either "hyperbolic" or "elliptic" geometry.