Etymology

lake of Wada

Today it means: Any of three disjoint connected open sets of the plane or open unit square with the counterintuitive property that they all have the same boundary. Full definition →

Japanese 和田の湖
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The story

  1. Japanese · calque of和田の湖
  2. English todaylake of Wada

Calque of Japanese 和田の湖. Introduced by Kunizo Yoneyama (in 1917), who credited the discovery to Takeo Wada.

Etymology from Wiktionary, CC BY-SA 4.0.