Etymology

Klein bottle

Today it means: The closed manifold obtained by identifying the boundary components of the annulus so that the resultant surface is nonorientable. Full definition →

German Kleinsche Flasche
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The story

  1. German · calque ofKleinsche Flasche
  2. English todayKlein bottle

Calque of German Kleinsche Flasche, named after German mathematician Felix Klein (1849–1925), who first described such a surface in 1882.

Etymology from Wiktionary, CC BY-SA 4.0.