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The text is But what is f (e)? We don't know what it is, but we do know that it belongs to R 1 .
The text is But what is f (e)? We don't know what it is, but we do know that it belongs to R 1 . Let's just call it k. Then Xf (e) = Xk As before, we can rewrite k as ke. Then, multiplying, we get Xk = Xke = kX Putting it all together yields f (X) = Xf (e) = Xk = Xke = kX why does Xke = kX?
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