Gregory Freiman

Gregory Abelevich Freiman (1926 to 2024) was a Russian and Israeli mathematician known for his work in additive number theory, in particular for proving Freiman theorem on sets with small sumsets. Born in Kazan, he graduated from Moscow University in 1949, took his candidate degree at Kazan University in 1956 and defended his doctor of sciences in 1965 under the joint supervision of Alexander Gelfond, Alexey Postnikov and Alexander Buchstab. He worked in Elabuga, Vladimir and Kalinin, and in the 1970s and early 1980s took part in the refusenik movement, writing a samizdat essay on discrimination against Jewish mathematicians in the Soviet Union. He later emigrated to Israel and became a professor at Tel Aviv University, where he was professor emeritus until his death at the age of 98.