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arxiv: 1202.4714 · v3 · pith:WLUFMVYVnew · submitted 2012-02-21 · 🧮 math.NT

The unramified Brauer group of norm one tori

classification 🧮 math.NT
keywords brauergroupunramifiedconstructionnormabelianbiquadraticconstruct
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Let k be a number field and K/k Galois. We transform the construction of the unramified Brauer group of the norm one torus R^1_K/k(G_m) into the construction of a special abelian extension over K. If k=Q and K/Q biquadratic, we explicitly construct the unramified Brauer group of R^1_K/Q(G_m).

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