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Published online by Cambridge University Press: 22 January 2016
Let p be a prime. If one adjoins to Q all pn -th roots of unity for n = 1, 2, 3, …, then the resulting field will contain a unique subfield Q∞ such that Q∞ is a Galois extension of Q with Gal
the additive group of p-adic integers. We will denote Gal(Q∞/Q ) by Γ.