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 Enlightened First to answer and accepted with score of 10 or more. This badge can be awarded multiple times.

Bob Pego earned this badge 2 times
apr 22 at 13:34
Are the eigenvalues of $AB$ equal to the eigenvalues of $BA$? (Citation needed!)
feb 11 '12 at 2:06
Did I just solve the Navier-Stokes Millennium Problem?

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