Gaston Tarry
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Gaston Tarry ( September 27, 1843 - June 21, 1913) was a French mathematician. Born in Villefranche de Panat, Aveyron, he studied mathematics at high school before joining the civil service in Algeria. He pursued mathematics as an amateur, his most famous achievement being his confirmation of Leonard Euler's conjecture that no 6×6 Graeco-Latin square was possible.