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Answer score of 25 or more. This badge can be awarded multiple times.

earned this badge 3 times.
Slice knots and exotic $\mathbb R^4$
Awarded Sep 19, 2020 at 15:56
Theoretical physics: Why not just $\mathbb{R}^4$?
Awarded Feb 17, 2016 at 0:43
More open problems
Awarded Dec 29, 2011 at 0:05

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