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'Johanna (Hanna) Neumann' (née von Caemmerer) (February 12 1914 – November 14 1971) was a German mathematician who worked on group theory.
Johanna was born in Lamkwitz, Germany. She attended Auguste-Viktoria-Schule and the University of Berlin and completed her studies in 1936 with distinctions in mathematics and physics. She began studying for her Ph.D. at the University of Göttingen in 1937. She moved to England in the following year to marry Bernhard Neumann, who as a Jew had fled the Nazis. They married in December and went on to have five children. Neumann completed her D Phil. in group theory at the University of Oxford in 1944 under Olga Taussky-Todd. Her thesis was entitled 'Sub-group Structure of Free Products of Groups with an Amalgamated Subgroup '. Following her naturalisation as a British citizen took a teaching position at the University of Hull in 1946. From 1958 she lectured at the Manchester College of Science and Technology.
The Neumanns moved to Australia in 1963 to take academic positions at the Australian National University. She was made chair of pure mathematics in 1964 and was dean of students between 1968 and 1969. Her most widely known work ''Varieties of Groups'' was published in 1967.
She died while on a lecture tour in Ottawa from a cerebral aneurysm. A building at the Australian National University was named in her honour in 1973. Four of her five children became mathematicians.

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★ Kenneth F. Fowler, Neumann, Johanna (Hanna) (1914 - 1971), Australian Dictionary of Biography, Volume 15, Melbourne University Press, 2000, p. 465.

★ Australian Academy of Science. Hanna Neumann 1914-1971