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Jun 13 at 15:30 comment added Timothy Chow Here's a better link for Gonthier's paper: A computer-checked proof of the Four Color Theorem.
May 15, 2014 at 23:35 history made wiki Post Made Community Wiki by Todd Trimble
May 15, 2014 at 17:19 comment added Timothy Chow The issue of background material is very important. In Gonthier's formalization of the four-color theorem, for example, the Jordan Curve Theorem was a major issue. Formalizing the full JCT would have been a major "digression" as it were. It required considerable creativity to figure out how to work around it. See Gonthier's paper for more information. research.microsoft.com/en-us/um/people/gonthier/4colproof.pdf Similarly, when Avigad formalized the prime number theorem, creativity was needed to find the version of the proof that would be the easiest to formalize.
May 15, 2014 at 14:35 history edited Jason Rute CC BY-SA 3.0
added 15 characters in body
May 15, 2014 at 13:17 history answered Jason Rute CC BY-SA 3.0