Karl Heinrich Weise
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Karl Heinrich Weise was a German mathematician. In 1956 he was the president of the German Mathematical Society.
Karl-Heinrich Weise 1987 in conversation with Martin Barner
Wolfgang Haken
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Wolfgang Haken was a German American mathematician who specialized in topology, in particular 3-manifolds.
Haken in 2008
Wolfgang Haken discusses the four-color theorem with Marshall Pangilinan. They are looking at the book 99 Variations on a Proof by Philip Ording.