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Jakow Trachtenberg (17 June 1888 - 1953) was a Russian Jewish mathematician who developed a system for mental arithmetic. After the Russian Revolution in 1917 he escaped to Germany. He was imprisoned in a concentration camp during World War II. His wife sold her jewelry to bribe the guards and he escaped to Switzerland. There he founded the Mathematical Institute in Zurich where he taught his system.

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14y ago

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