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Grigory M earned this badge 3 times
dec 2 '11 at 22:14Why $PSL_3(\mathbb F_2)\cong PSL_2(\mathbb F_7)$?
oct 20 '11 at 18:52Explicit formula for Fermat's 4k+1 theorem
sep 21 '11 at 1:07Counting subsets with r mod 5 elements