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Tamely ramified Hida theory

Assaf Goldberger, Ehud de Shalit (2002)

Annales de l’institut Fourier

Let J 1 be the Jacobian of the modular curve associated with Γ 1 ( N p ) , ( p , N ) = 1 and J 0 the one associated with Γ 1 ( N ) Γ 0 ( p ) . We study J 1 [ p - 1 ] as a Hecke and Galois-module. We relate a certain matrix of p -adic periods to the infinitesimal deformation of the U p -operator.

Tate sequences and lower bounds for ranks of class groups

Cornelius Greither (2013)

Acta Arithmetica

Tate sequences play a major role in modern algebraic number theory. The extension class of a Tate sequence is a very subtle invariant which comes from class field theory and is hard to grasp. In this short paper we demonstrate that one can extract information from a Tate sequence without knowing the extension class in two particular situations. For certain totally real fields K we will find lower bounds for the rank of the ℓ-part of the class group Cl(K), and for certain CM fields we will find lower...

The 2-Sylow subgroups of the tame kernel of imaginary quadratic fields

Hourong Qin (1995)

Acta Arithmetica

1. Introduction. Let F be a number field and O F the ring of its integers. Many results are known about the group K O F , the tame kernel of F. In particular, many authors have investigated the 2-Sylow subgroup of K O F . As compared with real quadratic fields, the 2-Sylow subgroups of K O F for imaginary quadratic fields F are more difficult to deal with. The objective of this paper is to prove a few theorems on the structure of the 2-Sylow subgroups of K O F for imaginary quadratic fields F. In our Ph.D. thesis (see...

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