Wolfgang Haken
![Wolfgang Haken discusses the four-color theorem with Marshall Pangilinan. They are looking at the book ''[[99 Variations on a Proof](https://upload.wikimedia.org/wikipedia/commons/e/e6/Wolfgang_Haken_with_Marshall_Pangilinan.jpg)
Wolfgang Haken (; June 21, 1928 – October 2, 2022) was a German American mathematician who specialized in topology, in particular 3-manifolds. Provided by Wikipedia
1
Published: [1989]
Superior document: Contemporary mathematics, volume 98
Links: Get full text