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Sur une question de capitulation. (On the capitulation problem). (French) Zbl 1010.11061

Soient \(p\) et \(q\) deux nombres premiers tels que \(p\equiv 1\pmod 8\), \(q\equiv -1\pmod 4\) et \(({p\over q})=-1\). On considre \(k_2^{(1)}\) le 2-corps de classes de Hilbert de \(k=\mathbb{Q}(\sqrt{pq},\sqrt{-1})\), \(k_2^{(2)}\) le 2-corps de classes de Hilbert de \(k^{(1)}_2\), puis \(G_2\) le groupe de Galois de \(k^{(2) }_2/k\). Comme le 2-groupe de classes de \(k\) est de type \((2,2)\), \(k^{(1)}_2\) contient trois sous-extensions quadratiques \(K_i/k\) \((i=1,2,3)\). A. Azizi étudie alors la capitulation des 2-classes de \(k\) dans \(K_i\) \((i= 1,2, 3)\), et détermine la structure de \(G_2\). Une étude analogue [Acta Arith. 94, 383-399 (2000; Zbl 0953.11033)] avait été menée par le même auteur dans le cas où \(d=2pq\), \(p\equiv -q\equiv 1\pmod 4\), et \(({p\over q})=-1\).

MSC:

11R27 Units and factorization
11R16 Cubic and quartic extensions
11R37 Class field theory

Citations:

Zbl 0953.11033
Full Text: DOI

References:

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[2] Abdelmalek Azizi, Sur le 2-groupe de classes d’idéaux de \?(\sqrt \?,\?), Rend. Circ. Mat. Palermo (2) 48 (1999), no. 1, 71 – 92 (French, with English summary). · Zbl 0920.11076 · doi:10.1007/BF02844380
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