René de Saussure instance of human
René de Saussure (17 March 1868 – 2 December 1943) was a Swiss Esperantist and professional mathematician (he defended a doctoral thesis on a subject in geometry at the Johns Hopkins University in 1895 and until 1899 he was professor at the Catholic University of America in Washington D.C. and later in Geneva and Berne), 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 ("Fundamental rules of word theory in Esperanto"), defending the language against several Idist critiques. He developed the concept of neceso kaj sufiĉo ("necessity and sufficience") by which he opposed the criticism of Louis Couturat that Esperanto lacks recursion.
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