Gaston Tarry
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Gaston Tarry (27 September 1843 – 21 June 1913) was a French mathematician. Born in Villefranche de Rouergue, Aveyron, he studied mathematics at high school before joining the civil service in Algeria. He pursued mathematics as an amateur.
In 1901 Tarry confirmed Leonhard Euler's conjecture that no 6×6 Graeco-Latin square was possible (the 36 officers problem).<ref>From Latin Squares to Sudoku:A History of Magic Numbers Template:Webarchive</ref><ref>36 Officer Problem Template:Webarchive</ref><ref>Template:Cite journal</ref><ref>Template:Cite journal</ref>