See also Elliptic geometry Gyrovector space Hyperbolic structure Hyperboloid structure Hjelmslev transformation Hyperbolic 3-manifold MISC@1 group Poincaré metric PERSON@1 -- Saccheri quadrilateral Spherical geometry MISC@2 geometry Notes References Coxeter , PERSON@2 -LRB- NUMBER@1 -RRB- MISC@3 geometry , ORGANIZATION@1 , PERSON@3 , PERSON@4 -LRB- NUMBER@2 -RRB- Hyperbolic geometry : The first NUMBER@3 years , Bull .

References Literature Coxeter , PERSON@2 -LRB- NUMBER@1 -RRB- MISC@3 geometry , ORGANIZATION@1 , PERSON@3 , PERSON@4 -LRB- NUMBER@2 -RRB- Hyperbolic geometry : The first NUMBER@3 years , Bull .
