Person: Ratner, Marina
Marina Ratner was a Russian mathematician who worked in Israel and America. She worked in ergodic theory.
Mathematical Profile (Excerpt):
 Marina grew up in Moscow where she attended school.
 After leaving school, Ratner applied to study at Moscow State University.
 Ratner graduated in 1961 having studied mathematics and physics as her main subjects.
 After graduating, Ratner worked for four years in Kolmogorov's applied statistics group and in his special school for gifted high school students.
 Of course Kolmogorov was an important influence on her during these years but a perhaps even greater influence was Yakov Grigorevich Sinai who was only three years older than Ratner and had been one of Kolmogorov's most outstanding students.
 In 1969, after submitting her thesis Geodesic Flows on Unit Tangent Bundles of Compact Surfaces of Negative Curvature, Ratner graduated with a degree equivalent to a Ph.D. In this thesis she studied the ergodic theory of geodesic flows on negatively curved surfaces, dynamical systems with very random behaviour which arise geometrically.
 After applying for a visa to emigrate to Israel, Ratner was dismissed from her position at the Engineering School in 1970.
 At Berkeley, Ratner was promoted steadily until she reached the rank of full professor in 1982.
 Marina's much acclaimed work of the last few years  the Raghunathan conjecture  are a farreaching generalisation and application of these ideas to an important situation.
 Marina saw that her methods were appropriate ones for this type of question, and eventually she gave a complete proof of the Raghunathan conjecture.
 Ratner was an invited plenary speaker at the congress.
 Ratner's lecture was entitled Interactions between ergodic theory, Lie groups and number theory.
 We have used quotations from awards that were given to Ratner to illustrate the importance of her mathematical contributions.
Born 30 October 1938, Moscow, Russia. Died 7 July 2017, El Cerrito, California, USA.
View full biography at MacTutor
Tags relevant for this person:
Origin Russia, Women
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References
Adapted from other CC BYSA 4.0 Sources:
 Oâ€™Connor, John J; Robertson, Edmund F: MacTutor History of Mathematics Archive