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Timeline for Blackbox Theorems

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Jun 15, 2012 at 20:36 comment added Dan Lee This doesn't quite seem to be in the spirit of what the original questioner was going for. This is more like, "Mathematical facts that people think that they understand but are actually a bit trickier than they think," which is interesting, but perhaps deserves its own thread.
Jun 15, 2012 at 0:24 comment added Daniel Moskovich Definitely, definitely true. Even more so for "the second part" of "the fundamental theorem of Morse Theory", that passing a critical point attaches a handle: mathoverflow.net/questions/70248/…
Jun 15, 2012 at 0:04 history answered Paul Siegel CC BY-SA 3.0