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After some revisions and developments, the conjecture took the form of “Every simply-connected, closed 3-manifold is homeomorphic to S
That’s the beauty of math: There’s always an answer for everything, even if takes years, decades, or even centuries to find it. That turned out to be much harder—as in, no one was able to solve for those integers for 65 years until a supercomputer finally came up with the solution to 42. So here are nine more brutally difficult math problems that once seemed impossible, until mathematicians found a breakthrough.
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