# Mathematician:Jakob Nielsen

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## Mathematician

Danish mathematician known for his work on automorphisms of surfaces.

## Nationality

Danish

## History

- Born: 15 October 1890 in Mjels, Als, Schleswig (now Denmark)
- Died: 3 August 1959 in Elsinore, Denmark

## Theorems and Definitions

- Fenchel-Nielsen Coordinates (with Moritz Werner Fenchel)
- Nielsen-Schreier Theorem (with Otto Schreier)
- Nielsen Transformation
- Nielsen Theory
- Nielsen-Thurston Classification (with William Paul Thurston)
- Nielsen Realization Problem

Results named for **Jakob Nielsen** can be found here.

Definitions of concepts named for **Jakob Nielsen** can be found here.

## Publications

- 2003:
*Discontinuous groups of isometries in the hyperbolic plane*(with Moritz Werner Fenchel)