Kleinian

adjective2

1. •
   Of or pertaining to Melanie Reizes Klein (1882–1960), Austrian-born British psychoanalyst who devised novel therapeutic techniques for children.
2. •
   Of or pertaining to Christian Felix Klein (1849–1925), German mathematician.

   • Prove that if a Kleinian group G does not contain parabolic elements and is isomorphic to the fundamental group of a closed orientable surface, then G is either quasi-Fuchsian or degenerate[…] — 1986