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Descente et parallélogramme galoisiens

Richard Massy, Sylvie Monier-Derviaux (1999)

Journal de théorie des nombres de Bordeaux

Soit p un nombre premier impair. Soit D / J une p -extension galoisienne de corps ne contenant pas les racines p -ièmes de l’unité : J μ p = 1 . Notons G le groupe de Galois de D / J et Φ ( G ) son sous-groupe de Frattini. Via une notion de descente galoisienne et les parallélogrammes galoisiens qu’elle induit, nous construisons ici toutes les extensions D / J telles que Φ ( G ) soit d’ordre p .

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