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Math Help - how to prove that it's the subring?

  1. #1
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    Talking how to prove that it's the subring?

    Given Ring R and S\subseteq R. If C(S)=\{x\in R | xa=ax, \forall a \in S\} then show that C(S) is the subring of R.
    Last edited by GTK X Hunter; November 28th 2009 at 03:30 PM.
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