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Possible Duplicate:
Ring such that $x^4=x$ for all $x$

Let $R$ be a ring such that $a^4=a$ $ ,\forall a \in R$. How do I show that $R$ is commutative?

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    Related: http://math.stackexchange.com/questions/16535/is-such-ring-commutative2011-11-16
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    I answered this here: http://math.stackexchange.com/questions/76792/ring-such-that-x4-x-for-all-x/77016#770162011-11-16

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