# 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.

German

## History

• Born: June 21, 1928

## Publications

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