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For example, we know that $x^5-x+1$ is a polynomial of degree five over $\mathbb Q$ that is not solvable by radicals. Which means that one of the roots of this polynomial is not in root closure of $\mathbb Q$. Is there a polynomial whose coefficients in $\mathbb Q$ such that none of the roots of this polynomial be in the root closure of $\mathbb Q$? In the other hand, can we find a polynomial over $\mathbb Q$ such that none of the roots of this polynomial Obtained by the operations multiplying, suming, Subtracting, Divising and rooting from elements of $\mathbb Q$

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    Thnaks for your answer, can we find a reference for your Theorem?2017-01-01
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    It's probably in Stewart's textbook, Galois Theory.2017-01-01

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