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Euclidean fields having a large Lenstra constant

Armin Leutbecher (1985)

Annales de l'institut Fourier

Based on a method of H. W. Lenstra Jr. in this note 143 new Euclidean number fields are given of degree n = 7 , 8 , 9 and 10 and of unit rank 5 . The search for these examples also revealed several other fields of small discriminant compared with the lower bounds of Odlyzko.

Euler system for Galois deformations

Tadashi Ochiai (2005)

Annales de l’institut Fourier

In this paper, we develop the Euler system theory for Galois deformations. By applying this theory to the Beilinson-Kato Euler system for Hida’s nearly ordinary modular deformations, we prove one of the inequalities predicted by the two-variable Iwasawa main conjecture. Our method of the proof of the Euler system theory is based on non-arithmetic specializations. This gives a new simplified proof of the inequality between the characteristic ideal of the Selmer group of a Galois deformation and the...

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