(Image: Wolfgang Haken in 2008 - own work)
One of my favorite math professors passed away last year and I regret not being timelier in reporting this. Wolfgang Haken, University of Illinois at Urbana- Champaign, together with Ken Appel, solved the four-color problem. This is the subject of an earlier post: Math Vacation: Four Color Map (jamesmacmath.blogspot.com). I really enjoyed his lectures and the enthusiasm he shared about mathematics.
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