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Bring radical: Characters, Other characterizations & Normal forms
In algebra, the Bring radical or ultraradical of a real number a is the unique real root of the polynomial x 5 + x + a . {\displaystyle x^{5}+x+a.} The Bring radical defines x {\displaystyle x} as an algebraic function of a {\displaystyle a} . It is the simplest algebraic function that cannot be expressed in terms of radicals.[citation needed]
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