SOLUTION: Is there a set of expressions that is closed under all four operations?

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Question 1020422: Is there a set of expressions that is closed under all four operations?
Answer by ikleyn(52788) About Me  (Show Source):
You can put this solution on YOUR website!
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The set of all rational functions of the form p%28x%29%2Fq%28x%29,
where p(x) and (q(x) are polynomials.