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

Tobias Kildetoft earned this badge 4 times
may 4 at 7:48
Why is $\sqrt{4} = 2$ and Not $\pm 2$?
may 2 at 8:39
If $G$ has only 2 proper, non-trivial subgroups then $G$ is cyclic
dec 12 at 20:36
If $x^3 =x$ then $6x=0$ in a ring
jun 28 at 15:15
All subgroup are Normal

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