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By about 1990, Kepler's conjecture was a prominent mathematics problem that famous mathematicians had worked on for decades with little progress.
Unresolved speaker · Mathematics Just Changed Forever — Kevin Hartnett · 26 Oct 2026
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“This had become Kepler's conjecture. It was one of the most interesting problems in mathematics, and many famous mathematicians had spent decades trying to solve it, honestly, without making too much progress.”2:15Report a misattribution
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