. . . . . . . . . . . . . . . . "Alexander Gamburd"@en . . . . . . . . . "1999"^^ . . . . . "Alexander Gamburd is a mathematician at the City University of New York known for his work in spectral problems in number theory, probability, and Arithmetic combinatorics. He is a Presidential Professor of Mathematics at the CUNY Graduate Center."@en . . . . . "1090228504"^^ . "Alexander Gamburd"@en . . . . . . . . . "64906285"^^ . . . . . . . . . . . . "6527"^^ . . . . "Alexander Gamburd"@en . . . . . . . . . . . . . . "\"On Spectral Gap for Infinite Index \"Congruence\" Subgroups of SL\""@en . . . . . . . . . . . . . "Alexander Gamburd is a mathematician at the City University of New York known for his work in spectral problems in number theory, probability, and Arithmetic combinatorics. He is a Presidential Professor of Mathematics at the CUNY Graduate Center."@en . . . . "United States"@en .