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Marina Ratner 1938-2017

16/07/2017
The Hebrew University and the Israeli mathematical community mourns the loss of Marina Ratner, eminent mathematician and Doctor Philosophiae Honoris Causa of the Hebrew University of Jerusalem. 
 
Marina Ratner was a former faculty member of the Hebrew University who taught at its Einstein Institute of Mathematics from 1971 until 1975. This followed her immigration to Israel from the former Soviet Union, where she had been a student of distinguished mathematician Yakov Sinai at Moscow State University. 
 
In 1975, Marina Ratner joined the University of California at Berkeley, rising to the position of Professor of Mathematics in 1982. During the 1980s and 1990s, Ratner developed techniques that enabled her to prove the now-celebrated Ratner rigidity theorems and, in particular, to give a striking proof of the important Raghunathan Conjecture. These landmark theorems are a basic pillar of the theory of homogeneous dynamics, with applicability to a broad spectrum of mathematical disciplines, and have inspired many subsequent developments in the field. Of particular note are the many deep and surprising applications of these rigidity theorems to number theory. 
 
Throughout her life, including the years when Soviet Jews experienced state-sanctioned anti-Semitism, Marina Ratner had been a committed advocate of Israel and the Jewish people, with her personal journey encapsulating some of the key events in contemporary Jewish history. She maintained warm relations with several generations of researchers at the Hebrew University’s Einstein Institute of Mathematics and has been steadfast in her support of Israeli mathematics. 
 
יהי זכרה ברוך 
Marina Ratner 1938-2017
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