# Mathematician:Hanna Neumann

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## Mathematician

German-born mathematician active in the field of group theory.

Wife of Bernhard Hermann Neumann and mother of Peter Michael Neumann.

## Nationality

German

## History

- Born: 12 February 1914 in Lankwitz, Berlin, Germany
- 1938: Moved to England to marry Bernhard Neumann.
- 1940: Gave birth to Peter Michael Neumann.
- Died: 14 November 1971 in Ottawa, Canada

## Theorems and Definitions

- HNN Extension (named after Graham Higman, Bernhard Hermann Neumann and Hanna Neumann)

## Publications

- 1949:
*Embedding theorems for groups*(with Graham Higman and Bernhard Hermann Neumann) - 1967:
*Varieties of Groups*

## Also known as

Full maiden name: **Johanna von Caemmerer**.