Kleinian

Adjective

Kleinian (comparative more Kleinian, superlative most Kleinian)

1. 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, S. Samuil Leibovich Krushkal', B. Boris Nikolaevich Apanasov, N. Nikolai Aleksandrovich Gusevskii, Kleinian Groups and Uniformization in Examples and Problems, page 166
2. Of or pertaining to Melanie Reizes Klein (1882–1960), Austrian-born British psychoanalyst who devised novel therapeutic techniques for children.
   • The second three months of life, the critical era in the Kleinian narrative, are marked by a shift from the paranoid to the "depressive" position produced by the infant's growing ability to integrate contradictory perceptions.1989, Elizabeth Abel, Virginia Woolf and the Fictions of Psychoanalysis, page 11