"1968-11-28Z"^^ . "1904Z"^^ . "1968Z"^^ . . "Leonard Roth (29 August 1904 Edmonton, London, England \u2013 28 November 1968 Pittsburgh, Pennsylvania) was a mathematician working in the Italian school of algebraic geometry. He introduced an example of a unirational variety that was not rational (though his proof that it was not rational was incomplete).His sister was Queenie Roth, literary critic and wife of F. R. Leavis."@en . "Mathematician" . "Roth, Leonard"@en . "1904-08-29Z"^^ . .