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Bryna Kra
Bryna Rebekah Kra (born 1966) is an American mathematician who works in dynamical systems and ergodic theory, and uses dynamical methods to address problems in number theory and combinatorics. She has made contributions to the structure theory of characteristic factors for multiple ergodic averages.〔.〕 ==Career== She graduated with a bachelor's degree from Harvard University in 1988, and obtained her Ph.D. from Stanford University in 1995 under the guidance of Yitzhak Katznelson. She held postdoctoral positions at the Hebrew University in Jerusalem, the University of Michigan, the IHES and the Ohio State University before joining the mathematics faculty at Pennsylvania State University as an assistant professor. Since 2004 Kra has been a professor of mathematics at Northwestern University, where she was department chair from 2009 to 2012.
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