# Mathematician:Wolfgang Haken

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## Mathematician

German mathematician mainly involved in topology where the bulk of his work has been on 3-dimensional manifolds.

In $1976$, along with Kenneth Ira Appel, proved the Four Color Theorem with the help of a computer.

## Nationality

German

## History

- Born: June 21, 1928

## Theorems and Definitions

- Four Color Theorem (with Kenneth Ira Appel)
- Haken Manifold
- Kneser-Haken Finiteness (with Hellmuth Kneser)

## Publications

- 1961:
*Theorie der Normalflachen*(*Acta Math.***Vol. 105**: 245 – 375)