Serge Lang (French: [lɑ̃ɡ]; May 19, 1927 – September 12, 2005) was a French-born American mathematician and activist. He is known for his work in number theory and for his mathematics textbooks, including the influential Algebra. He was a member of the Bourbaki group. At the time of his death he was professor emeritus of mathematics at Yale University.
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