"Gergen, John Jay"@en . "1967Z"^^ . "John Jay Gergen (St. Paul, Minnesota April 17, 1903 \u2013 Duke University Hospital 1967) was an American mathematician who introduced the Lebesgue\u2013Gergen criterion for convergence of a Fourier series.He received a B.A. from the University of Minnesota in 1925 and a Ph.D. from Rice University in 1928. From 1928 to 1930, as a National Research fellow, he visited Princeton, Oxford, the University of Paris and the University of Clermont."@en . "1903-04-17Z"^^ . "American mathematician" . "1903Z"^^ .