René de Saussure

René de Saussure was a Swiss Esperantist and professional mathematician, who composed important works about Esperanto and interlinguistics from a linguistic viewpoint. He was born in Geneva, Switzerland. His chef d'oeuvre is an analysis on the logic of word construction in Esperanto, Fundamentaj reguloj de la vortteorio en Esperanto, defending the language against several Idist critiques. He developed the concept of neceso kaj sufiĉo by which he opposed the criticism of Louis Couturat that Esperanto lacks recursion.