Abstract.
Let p be a rational prime and let a be an integer which is divisible by p exactly to the first power. Then the Galois group \(G = \hbox{Gal}_{{\mathbb{Q}}}(f)\) of the Eisenstein polynomial f = X p + aX + a is known to be either the full symmetric group S p or the affine group A(1, p), and it is conjectured that always G = S p . In this note we settle this conjecture for p = 5 and, answering a question by J.-P. Serre, we show that this does not carry over when replacing the integer a by some rational number with 5-adic valuation equal to 1.
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Received: 6 June 2007
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Gauckler, L. The Galois group of the Eisenstein polynomial X 5 + aX + a . Arch. Math. 90, 136–139 (2008). https://doi.org/10.1007/s00013-007-2480-0
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DOI: https://doi.org/10.1007/s00013-007-2480-0